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<document ID-DOI="http://dx.doi.org/10.3897/phytokeys.101.25057" ID-PMC="PMC6031701" ID-Pensoft-Pub="1314-2003-101-1" ID-Pensoft-UUID="FFDEFFE96861FF9F4264FFEFA61CC145" ID-PubMed="29997443" ID-Zenodo-Dep="1305467" ModsDocID="1314-2003-101-1" checkinTime="1530177857167" checkinUser="pensoft" docAuthor="Pellegrini, Marco O. O." docDate="2018" docId="8EDCFF95692E419D699C23692B43630A" docLanguage="en" docName="PhytoKeys 101: 1-97" docOrigin="PhytoKeys 101" docPubDate="2018-06-27" docSource="http://dx.doi.org/10.3897/phytokeys.101.25057" docTitle="Tradescantia (Austrotradescantia) chrysophylla subsp. subg. (D. R. Hunt) M. Pell., PhytoKeys 89: 47. 2017." docType="treatment" docVersion="3" id="FFDEFFE96861FF9F4264FFEFA61CC145" lastPageNumber="11" masterDocId="FFDEFFE96861FF9F4264FFEFA61CC145" masterDocTitle="Wandering throughout South America: Taxonomic revision of Tradescantia subg. Austrotradescantia (D. R. Hunt) M. Pell. (Commelinaceae)" masterLastPageNumber="97" masterPageNumber="1" pageNumber="2" updateTime="1668138924118" updateUser="ExternalLinkService">
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<mods:titleInfo>
<mods:title>Wandering throughout South America: Taxonomic revision of Tradescantia subg. Austrotradescantia (D. R. Hunt) M. Pell. (Commelinaceae)</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Pellegrini, Marco O. O.</mods:namePart>
<mods:affiliation>Universidade de Sao Paulo, Departamento de Botanica, Rua do Matao 277, CEP 05508 - 900, Sao Paulo, SP, Brazil</mods:affiliation>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:title>PhytoKeys</mods:title>
</mods:titleInfo>
<mods:part>
<mods:date>2018</mods:date>
<mods:detail type="pubDate">
<mods:number>2018-06-27</mods:number>
</mods:detail>
<mods:detail type="volume">
<mods:number>101</mods:number>
</mods:detail>
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<mods:start>1</mods:start>
<mods:end>97</mods:end>
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<mods:url>http://dx.doi.org/10.3897/phytokeys.101.25057</mods:url>
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<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.3897/phytokeys.101.25057</mods:identifier>
<mods:identifier type="Pensoft-Pub">1314-2003-101-1</mods:identifier>
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<treatment ID-GBIF-Taxon="182225018" LSID="urn:lsid:plazi:treatment:8EDCFF95692E419D699C23692B43630A" httpUri="http://treatment.plazi.org/id/8EDCFF95692E419D699C23692B43630A" lastPageId="10" lastPageNumber="11" pageId="1" pageNumber="2">
<subSubSection pageId="1" pageNumber="2" type="nomenclature">
<paragraph pageId="1" pageNumber="2">
<taxonomicName authority="(D. R. Hunt) M. Pell., PhytoKeys 89: 47. 2017." authorityName="(D. R. Hunt) M. Pell., PhytoKeys 89: 47. 2017." class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="1" pageNumber="2" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia (D.R.Hunt) M.Pell., PhytoKeys 89: 47. 2017.</taxonomicName>
</paragraph>
</subSubSection>
<subSubSection pageId="1" pageNumber="2" type="reference_group">
<paragraph pageId="1" pageNumber="2">
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia subsp. sect." order="Commelinales" pageId="1" pageNumber="2" phylum="Tracheophyta" rank="section" section="Austrotradescantia">Tradescantia sect. Austrotradescantia</taxonomicName>
D.R.Hunt, Kew Bull. 35(2): 440. 1980.
</paragraph>
<paragraph pageId="1" pageNumber="2">
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tropitria" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tropitria" order="Commelinales" pageId="1" pageNumber="2" phylum="Tracheophyta" rank="genus">Tropitria</taxonomicName>
Raf., Fl. Tell. 3: 68. 1837. Type species.
<taxonomicName authorityName="Raf" authorityYear="1837" baseAuthorityName="Link &amp; Otto" class="Liliopsida" family="Commelinaceae" genus="Tropitria" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tropitria crassula" order="Commelinales" pageId="1" pageNumber="2" phylum="Tracheophyta" rank="species" species="crassula">Tropitria crassula</taxonomicName>
(Link &amp; Otto) Raf. (≡
<taxonomicName family="Commelinaceae" higherTaxonomySource="treatment-meta" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="1" pageNumber="2" rank="species" species="crassula">T. crassula</taxonomicName>
Link &amp; Otto)
</paragraph>
</subSubSection>
<subSubSection pageId="1" pageNumber="2" type="type species">
<paragraph pageId="1" pageNumber="2">Type species.</paragraph>
<paragraph pageId="1" pageNumber="2">
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia fluminensis" order="Commelinales" pageId="1" pageNumber="2" phylum="Tracheophyta" rank="species" species="fluminensis">
<emphasis italics="true" pageId="1" pageNumber="2">Tradescantia fluminensis</emphasis>
</taxonomicName>
Vell.
</paragraph>
</subSubSection>
<subSubSection pageId="1" pageNumber="2" type="description">
<paragraph pageId="1" pageNumber="2">Description.</paragraph>
<paragraph pageId="1" pageNumber="2">
<emphasis italics="true" pageId="1" pageNumber="2">Herbs</emphasis>
chamaephytes, base definite or indefinite, perennial, frequently succulent, terrestrial, rupicolous or epiphytes.
<emphasis italics="true" pageId="1" pageNumber="2">Roots</emphasis>
thin, fibrous.
<emphasis italics="true" pageId="1" pageNumber="2">Stems</emphasis>
prostrate with ascending apex or erect, herbaceous to succulent, rarely fibrous, little to densely branched, rooting at the basal nodes or at the distal ones when they touch the substrate.
<emphasis italics="true" pageId="1" pageNumber="2">Leaves</emphasis>
sessile to subpetiolate; distichously or spirally-alternate, evenly distributed along the stem, rarely congested in a rosette; sheaths closed; ptyxis involute or convolute; blades flat to falcate and/or complicate, base asymmetrical, midvein conspicuous, rarely inconspicuous, adaxially impressed, abaxially prominent, rounded, secondary veins conspicuous or inconspicuous.
<emphasis italics="true" pageId="1" pageNumber="2">Synflorescences</emphasis>
terminal or axillary in the distal portion of the stems, composed of a solitary main florescence, 1-4 per leaf axis.
<emphasis italics="true" pageId="1" pageNumber="2">Inflorescences (main florescences)</emphasis>
consisting of a pedunculate double-cincinni fused back to back, sometimes composed of 1-3(-5) cincinni; inflorescence bract hyaline, tubular, inconspicuous; peduncle bracts absent; supernumerary bracts rarely present; cincinni bracts leaf-like, rarely spathaceous, differing from the leaves mostly only in size, similar or unequal to each other, saccate or not, free from each other; cincinni sessile, contracted, opposite to subopposite; bracteoles inconspicuous, imbricate, linear-triangular to triangular, hyaline.
<emphasis italics="true" pageId="1" pageNumber="2">Flowers</emphasis>
bisexual, actinomorphic, flat (not forming a floral tube); pedicel gibbous at apex, upright at anthesis and pre-anthesis, deflexed at post-anthesis; sepals equal, free, chartaceous, ovate, dorsally keeled or not, apex acute; petals sessile, equal, free, elliptic to ovate to broadly ovate, flat or plicate, base cuneate to obtuse, margin glabrous, apex acute; stamens 6, arranged in two series, equal, filaments free from the petals, straight at anthesis and post-anthesis, white, rarely pink, basally densely bearded with moniliform hairs, hairs as long as the stamens, white, anthers basifixed, rimose, connective rhomboid, yellow, anther sacs ellipsoid, yellow, pollen yellow; ovary subglobose to globose, white, glabrous, locules 2-ovulate, style straight at anthesis and post-anthesis, white, obconical at base, conical at the apex, stigma punctate, pistil longer than or the same length as the stamens.
<emphasis italics="true" pageId="1" pageNumber="2">Capsules</emphasis>
subglobose to globose, light to medium brown when mature, glabrous, loculicidal, 3-valved, sometimes apiculate due to persistent style base.
<emphasis italics="true" pageId="1" pageNumber="2">Seeds</emphasis>
1-2 per locule, ellipsoid to narrowly trigonal, ventrally flattened, cleft or not towards the embryotega, testa costate to rugose with ridges radiating from the embryotega; embryotega dorsal, relatively inconspicuous, without a prominent apicule, generally covered by a cream farina; hilum linear, on a weak ridge.
</paragraph>
</subSubSection>
<subSubSection lastPageId="2" lastPageNumber="3" pageId="1" pageNumber="2" type="habitat">
<paragraph pageId="1" pageNumber="2">Habitat, distribution and ecology.</paragraph>
<paragraph lastPageId="2" lastPageNumber="3" pageId="1" pageNumber="2">
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="1" pageNumber="2" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
is distributed from southern Bolivia, Paraguay, Argentina, Southeastern to Southern Brazil
<pageBreakToken pageId="2" pageNumber="3" start="start">and</pageBreakToken>
Uruguay (Fig.
<figureCitation captionStart="Figure 1" captionStartId="F1" captionText="Figure 1. Distribution of Tradescantia subg. Austrotradescantia. Modified from Pellegrini (2017)." figureDoi="10.3897/phytokeys.101.25057.figure1" httpUri="https://binary.pensoft.net/fig/211894" pageId="2" pageNumber="3">1</figureCitation>
). Its species can be found growing understorey in moist and shady forests, open fields, rocky outcrops and are especially common in disturbed areas (
<bibRefCitation author="Pellegrini, MOO" journalOrPublisher="Flora" pageId="59" pageNumber="60" refId="B35" refString="Pellegrini, MOO, 2015. Filogenia e revisao taxonomica de Tradescantia L. sect. Austrotradescantia D.R.Hunt (Commelinaceae). MSc thesis, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil." title="Filogenia e revisao taxonomica de Tradescantia L. sect. Austrotradescantia D. R. Hunt (Commelinaceae). MSc thesis, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil." year="2015">Pellegrini 2015</bibRefCitation>
,
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">2017</bibRefCitation>
;
<bibRefCitation DOI="https://doi.org/10.1600/036364416X694053" author="Pellegrini, MOO" journalOrPublisher="Taxon" pageId="60" pageNumber="61" refId="B40" refString="Pellegrini, MOO, Forzza, RC, Sakuragui, CM, 2016. https://doi.org/10.1600/036364416X694053" url="https://doi.org/10.1600/036364416X694053" year="2016">Pellegrini et al. 2016</bibRefCitation>
).
</paragraph>
<caption ID-Zenodo-Dep="1305507" doi="10.3897/phytokeys.101.25057.figure1" httpUri="https://binary.pensoft.net/fig/211894" pageId="2" pageNumber="3" start="Figure 1" startId="F1">
<paragraph pageId="2" pageNumber="3">
<emphasis bold="true" pageId="2" pageNumber="3">Figure 1.</emphasis>
Distribution of
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
. Modified from
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini (2017)</bibRefCitation>
.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="2" pageNumber="3" type="conservation and invasiveness">
<paragraph pageId="2" pageNumber="3">Conservation and invasiveness.</paragraph>
<paragraph pageId="2" pageNumber="3">
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
as a whole seems to be in need of little conservationist attention. Most species possess wide native distribution, with only
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. atlantica" order="Liliales" pageId="2" pageNumber="3" rank="species" species="atlantica">
<emphasis italics="true" pageId="2" pageNumber="3">T. atlantica</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. chrysophylla" order="Liliales" pageId="2" pageNumber="3" rank="species" species="chrysophylla">
<emphasis italics="true" pageId="2" pageNumber="3">T. chrysophylla</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. hertweckii" order="Liliales" pageId="2" pageNumber="3" rank="species" species="hertweckii">
<emphasis italics="true" pageId="2" pageNumber="3">T. hertweckii</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="2" pageNumber="3" rank="species" species="seubertiana">
<emphasis italics="true" pageId="2" pageNumber="3">T. seubertiana</emphasis>
</taxonomicName>
possessing narrower distributions and thus meriting some conservationist attention. Out of the 13 species accepted in the present study, one (i.e.
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="2" pageNumber="3" rank="species" species="fluminensis">
<emphasis italics="true" pageId="2" pageNumber="3">T. fluminensis</emphasis>
</taxonomicName>
) is already known to represent a troublesome weed worldwide, while the other species have never been considered invasive or to possess an invasive potential. Nonetheless, after careful examination of herbarium specimens collected outside the subgenus native distribution range, I came to the conclusion that several records of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="2" pageNumber="3" rank="species" species="fluminensis">
<emphasis italics="true" pageId="2" pageNumber="3">T. fluminensis</emphasis>
</taxonomicName>
as a weed actually represent misidentified specimens of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="2" pageNumber="3" rank="species" species="mundula">
<emphasis italics="true" pageId="2" pageNumber="3">T. mundula</emphasis>
</taxonomicName>
or, more rarely, specimens of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="2" pageNumber="3" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="2" pageNumber="3">T. cymbispatha</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="2" pageNumber="3" rank="species" species="crassula">
<emphasis italics="true" pageId="2" pageNumber="3">T. crassula</emphasis>
</taxonomicName>
.
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia cerinthoides" order="Commelinales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="2" pageNumber="3">Tradescantia cerinthoides</emphasis>
</taxonomicName>
is also widely cultivated worldwide, especially its pink and lilac-flowered morphs. Despite my not having observed any unquestionable records that indicate that
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="2" pageNumber="3" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="2" pageNumber="3">T. cerinthoides</emphasis>
</taxonomicName>
has escaped from cultivation, this species also possesses intense vegetative growth and thus a great potential to become an invasive species if not properly monitored. All invasive accessions done so far for
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="2" pageNumber="3" rank="species" species="fluminensis">
<emphasis italics="true" pageId="2" pageNumber="3">T. fluminensis</emphasis>
</taxonomicName>
must urgently be redone in order to properly understand extension of this
<normalizedToken originalValue="species’">species'</normalizedToken>
invasion, discount records now known to represent other species from the subgenus and to appropriately access the threat of invasiveness of the other species of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="2" pageNumber="3" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
which also possess records outside their native range.
</paragraph>
</subSubSection>
<subSubSection pageId="2" pageNumber="3" type="etymology">
<paragraph pageId="2" pageNumber="3">Etymology.</paragraph>
<paragraph pageId="2" pageNumber="3">
The name of this subgenus means &quot;
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="2" pageNumber="3">Tradescantia</emphasis>
</taxonomicName>
from the South&quot;, making reference to its exclusively South American distribution.
</paragraph>
</subSubSection>
<subSubSection lastPageId="3" lastPageNumber="4" pageId="2" pageNumber="3" type="comments">
<paragraph pageId="2" pageNumber="3">Comments.</paragraph>
<paragraph lastPageId="3" lastPageNumber="4" pageId="2" pageNumber="3">
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
is a morphologically peculiar group in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="2" pageNumber="3" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="2" pageNumber="3">Tradescantia</emphasis>
</taxonomicName>
, being easily recognised by its generally distichously-alternate leaves, sepals ovate, generally all dorsally keeled; filaments basally densely bearded with long moniliform hairs; style obconic at base and conic at apex, stigma punctate with type D papillae; seeds with costate testa and relatively inconspicuous embryotega; small bimodal and numerous chromosomes (
<emphasis italics="true" pageId="2" pageNumber="3">n</emphasis>
= 10-numerous); and a unique chemical profile (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Two morphological groups are accepted for the subgenus, both supported by recent phylogenetic studies (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). The
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="2" pageNumber="3" rank="species" species="fluminensis">
<emphasis italics="true" pageId="2" pageNumber="3">T. fluminensis</emphasis>
</taxonomicName>
group is composed of generally more delicate plants, with prostrate stems with ascending apex, indefinite bases, subpetiolate leaves, cincinni bracts saccate at base and white petals. Nonetheless, this group also includes the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="2" pageNumber="3" rank="species" species="tenella">
<emphasis italics="true" pageId="2" pageNumber="3">T. tenella</emphasis>
</taxonomicName>
complex, which possesses erect stems, definite base, flowers that range from white to pink, seeds with rugose testa and hilum shorter than half the length of the seeds. The species in the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="2" pageNumber="3" rank="species" species="fluminensis">
<emphasis italics="true" pageId="2" pageNumber="3">T. fluminensis</emphasis>
</taxonomicName>
group occur almost exclusively in Tropical and Subtropical Rainforests but are also commonly found growing as weedy plants throughout their distribution range (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). The
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="2" pageNumber="3" rank="species" species="crassula">
<emphasis italics="true" pageId="2" pageNumber="3">T. crassula</emphasis>
</taxonomicName>
group is composed of succulent plants, with erect stems, complicate leaves, cincinni bracts not saccate at base, petals ranging from white to pink to lilac and seeds cleft towards the embryotega. These species are intimately related to the two southern domains of South America, characterised by open and/or drier vegetation formations: the Chaco (which is part of the Dry Diagonal) and the Pampa (which is
<pageBreakToken pageId="3" pageNumber="4" start="start">mostly</pageBreakToken>
represented by grasslands). The species from the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="3" pageNumber="4" rank="species" species="crassula">
<emphasis italics="true" pageId="3" pageNumber="4">T. crassula</emphasis>
</taxonomicName>
group are morphologically very similar due to many overlapping morphological characters; with indumentum type and distribution in the sepals being the most useful character for separating its species.
</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="recommendations for field collectors">
<paragraph pageId="4" pageNumber="5">
<pageBreakToken pageId="4" pageNumber="5" start="start">Recommendations</pageBreakToken>
for field collectors.
</paragraph>
<paragraph pageId="4" pageNumber="5">
As widely known,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="" order="Liliales" pageId="4" pageNumber="5" rank="family">Commelinaceae</taxonomicName>
is a group where flowers are generally poorly preserved in herbarium specimens, making it especially difficult to work with (Faden 1991). In
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="4" pageNumber="5" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, taxonomy relies greatly on indumentum characters, with its type, distribution and colouration being especially important. Moreover, the indumentum in the pedicels and sepals seems to be constant within the same species and variable between different species. Thus, I recommend that field workers pay special attention to the
<normalizedToken originalValue="plant’s">plant's</normalizedToken>
indumentum, collect young and mature branches in order to correctly characterise the species (since features like the presence of a subpetiole and shape of the leaf-blades might vary during development), record the colouration of vegetative and reproductive organs and, whenever possible, attach photographs to the herbarium sheets. Images are of great aid and can help identify even the most incomplete and damaged specimens. Furthermore, whenever possible, spirit collections and live specimens for cultivation are welcome, since they enable the proper study of the delicate flowers of these plants and live specimens might help us understand their morphological variation and plasticity.
</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="roots, stems and growth forms">
<paragraph pageId="4" pageNumber="5">Roots, stems and growth forms.</paragraph>
<paragraph pageId="4" pageNumber="5">
As stated by
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini (2017)</bibRefCitation>
, most
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="4" pageNumber="5" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="4" pageNumber="5">Tradescantia</emphasis>
</taxonomicName>
species are perennial herbs, all of them lacking rhizomes. In
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="4" pageNumber="5" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, the roots are always thin and fibrous and never tuberised as in many species of the other four subgenera. In the mat-forming species, roots are produced throughout the stems, whenever they touch the substrate. In the species with erect stems, roots are restricted to the basal-most nodes of the plants. The stems can vary in posture, from prostrate (generally with ascending apex) to erect, while the branching pattern ranges from unbranched to little branched at the base or branched to densely branched in the upper half. The leaf-opposed line of uniseriate hairs is generally observable in most species, except
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="4" pageNumber="5" rank="species" species="seubertiana">
<emphasis italics="true" pageId="4" pageNumber="5">T. seubertiana</emphasis>
</taxonomicName>
which is completely glabrous. Nonetheless, it is not constant in any of the remaining species, being either present or absent, depending on the specimen or even on the maturation and/or position of the stem (i.e. younger shoots tend to produce this leaf-opposed line of uniseriate hairs, which is generally lost with age). Finally, in species densely covered by indumentum, such as
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="4" pageNumber="5" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="4" pageNumber="5">T. cerinthoides</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. chrysophylla" order="Liliales" pageId="4" pageNumber="5" rank="species" species="chrysophylla">
<emphasis italics="true" pageId="4" pageNumber="5">T. chrysophylla</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="4" pageNumber="5" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="4" pageNumber="5">T. cymbispatha</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="4" pageNumber="5" rank="species" species="mundula">
<emphasis italics="true" pageId="4" pageNumber="5">T. mundula</emphasis>
</taxonomicName>
, the leaf-opposed line of uniseriate hairs is generally absent or, if present, is very hard to differentiate from the dense surrounding indumentum.
</paragraph>
</subSubSection>
<subSubSection lastPageId="5" lastPageNumber="6" pageId="4" pageNumber="5" type="indumentum">
<paragraph pageId="4" pageNumber="5">Indumentum.</paragraph>
<paragraph lastPageId="5" lastPageNumber="6" pageId="4" pageNumber="5">
The indumentum in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="4" pageNumber="5" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
is consistently composed of uniseriate hairs, ranging from eglandular to glandular (Fig.
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Indumentum morphology in Tradescantia subg. Austrotradescantia. A completely glabrous stems and leaves in T. seubertiana B glabrous leaf-blade of T. crassula, showing the ciliate margin C abaxial side of a leaf-blade of T. cerinthoides, showing the sparsely hispid indumentum D adaxial side of a leaf-blade of T. cerinthoides, showing the hispid indumentum E adaxial side of a leaf-blade of T. tenella, showing the hirsute indumentum and ciliate margin F sepal of T. tenella, showing the glandular-pubescent indumentum. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure2" httpUri="https://binary.pensoft.net/fig/211895" pageId="4" pageNumber="5">2C-F</figureCitation>
). Special attention should be also given to the prickle-hairs that are generally 2-celled and present at the margins of the leaf-sheaths and blades (Fig.
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Indumentum morphology in Tradescantia subg. Austrotradescantia. A completely glabrous stems and leaves in T. seubertiana B glabrous leaf-blade of T. crassula, showing the ciliate margin C abaxial side of a leaf-blade of T. cerinthoides, showing the sparsely hispid indumentum D adaxial side of a leaf-blade of T. cerinthoides, showing the hispid indumentum E adaxial side of a leaf-blade of T. tenella, showing the hirsute indumentum and ciliate margin F sepal of T. tenella, showing the glandular-pubescent indumentum. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure2" httpUri="https://binary.pensoft.net/fig/211895" pageId="4" pageNumber="5">2B, E</figureCitation>
), but consistently absent only in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="4" pageNumber="5" rank="species" species="seubertiana">
<emphasis italics="true" pageId="4" pageNumber="5">T. seubertiana</emphasis>
</taxonomicName>
(Fig.
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Indumentum morphology in Tradescantia subg. Austrotradescantia. A completely glabrous stems and leaves in T. seubertiana B glabrous leaf-blade of T. crassula, showing the ciliate margin C abaxial side of a leaf-blade of T. cerinthoides, showing the sparsely hispid indumentum D adaxial side of a leaf-blade of T. cerinthoides, showing the hispid indumentum E adaxial side of a leaf-blade of T. tenella, showing the hirsute indumentum and ciliate margin F sepal of T. tenella, showing the glandular-pubescent indumentum. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure2" httpUri="https://binary.pensoft.net/fig/211895" pageId="4" pageNumber="5">2A</figureCitation>
). Glandular hairs can be found in the vegetative organs of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="4" pageNumber="5" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="4" pageNumber="5">T. cerinthoides</emphasis>
</taxonomicName>
but are consistently found in the pedicels of most species and the sepals of many (Fig.
<figureCitation captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Indumentum morphology in Tradescantia subg. Austrotradescantia. A completely glabrous stems and leaves in T. seubertiana B glabrous leaf-blade of T. crassula, showing the ciliate margin C abaxial side of a leaf-blade of T. cerinthoides, showing the sparsely hispid indumentum D adaxial side of a leaf-blade of T. cerinthoides, showing the hispid indumentum E adaxial side of a leaf-blade of T. tenella, showing the hirsute indumentum and ciliate margin F sepal of T. tenella, showing the glandular-pubescent indumentum. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure2" httpUri="https://binary.pensoft.net/fig/211895" pageId="4" pageNumber="5">2F</figureCitation>
). As aforementioned, indumentum morphology is key for species delimitation in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="4" pageNumber="5" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, being easily observed most of the time. Nonetheless, some species are especially susceptible to the excessive heat of some plant driers, which can lead to an artificial loss of hairs. Two good examples are
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="4" pageNumber="5" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="4" pageNumber="5">T. cymbispatha</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="4" pageNumber="5" rank="species" species="mundula">
<emphasis italics="true" pageId="4" pageNumber="5">T. mundula</emphasis>
</taxonomicName>
, where the first has been observed to sometimes lose its characteristic dense strigose indumentum in some excessively dried specimens from Argentina and Southern Brazil, while the second presents delicate sepal hairs that commonly fall dur
<pageBreakToken pageId="5" pageNumber="6" start="start">ing</pageBreakToken>
the drying process. However, due to the almost unique combination of morphological characters (e.g. sessile and succulent leaves, with generally elliptic blades and sepals lacking dorsal keels and evenly velutine),
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="5" pageNumber="6" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="5" pageNumber="6">T. cymbispatha</emphasis>
</taxonomicName>
can be easily identified even when the vegetative hairs are almost completely lost during the excessive drying process. In
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="5" pageNumber="6" rank="species" species="mundula">
<emphasis italics="true" pageId="5" pageNumber="6">T. mundula</emphasis>
</taxonomicName>
, this partial loss of sepal hairs can lead to confusion in the identification of dried specimens, making it even more similar to
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="5" pageNumber="6" rank="species" species="fluminensis">
<emphasis italics="true" pageId="5" pageNumber="6">T. fluminensis</emphasis>
</taxonomicName>
<emphasis italics="true" pageId="5" pageNumber="6">s.s.</emphasis>
</paragraph>
<caption ID-Zenodo-Dep="1305529" doi="10.3897/phytokeys.101.25057.figure2" httpUri="https://binary.pensoft.net/fig/211895" pageId="5" pageNumber="6" start="Figure 2" startId="F2">
<paragraph pageId="5" pageNumber="6">
<emphasis bold="true" pageId="5" pageNumber="6">Figure 2.</emphasis>
Indumentum morphology in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="5" pageNumber="6" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
.
<emphasis bold="true" pageId="5" pageNumber="6">A</emphasis>
completely glabrous stems and leaves in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="5" pageNumber="6" rank="species" species="seubertiana">
<emphasis italics="true" pageId="5" pageNumber="6">T. seubertiana</emphasis>
</taxonomicName>
<emphasis bold="true" pageId="5" pageNumber="6">B</emphasis>
glabrous leaf-blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="5" pageNumber="6" rank="species" species="crassula">
<emphasis italics="true" pageId="5" pageNumber="6">T. crassula</emphasis>
</taxonomicName>
, showing the ciliate margin
<emphasis bold="true" pageId="5" pageNumber="6">C</emphasis>
abaxial side of a leaf-blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="5" pageNumber="6" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="5" pageNumber="6">T. cerinthoides</emphasis>
</taxonomicName>
, showing the sparsely hispid indumentum
<emphasis bold="true" pageId="5" pageNumber="6">D</emphasis>
adaxial side of a leaf-blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="5" pageNumber="6" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="5" pageNumber="6">T. cerinthoides</emphasis>
</taxonomicName>
, showing the hispid indumentum
<emphasis bold="true" pageId="5" pageNumber="6">E</emphasis>
adaxial side of a leaf-blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="5" pageNumber="6" rank="species" species="tenella">
<emphasis italics="true" pageId="5" pageNumber="6">T. tenella</emphasis>
</taxonomicName>
, showing the hirsute indumentum and ciliate margin
<emphasis bold="true" pageId="5" pageNumber="6">F</emphasis>
sepal of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="5" pageNumber="6" rank="species" species="tenella">
<emphasis italics="true" pageId="5" pageNumber="6">T. tenella</emphasis>
</taxonomicName>
, showing the glandular-pubescent indumentum. Photos by M.O.O. Pellegrini.
</paragraph>
</caption>
</subSubSection>
<subSubSection lastPageId="6" lastPageNumber="7" pageId="5" pageNumber="6" type="leaves">
<paragraph pageId="5" pageNumber="6">Leaves.</paragraph>
<paragraph lastPageId="6" lastPageNumber="7" pageId="5" pageNumber="6">
The leaves in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="5" pageNumber="6" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
can range from distichously- to spirally-alternate, sometimes in the same species (e.g. most species belonging to
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="5" pageNumber="6" rank="species" species="crassula">
<emphasis italics="true" pageId="5" pageNumber="6">T. crassula</emphasis>
</taxonomicName>
group), from sessile to distinctively subpetiolate (Fig.
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Leaf morphology in Tradescantia subg. Austrotradescantia. A elliptic blade of T. cerinthoides, showing the dark green colouration and obtuse apex B broadly ovate blade of T. cymbispatha, showing the bluish-green colouration, vinaceous margins, the densely strigose indumentum and cordate base C linear blade of T. decora, showing the conduplicate and falcate posture and truncate base D one of the uppermost leaves from T. fluminensis, showing the dark green colouration, inconspicuous subpetiole, impressed secondary veins and cordate base E blade of T. mundula, showing the short subpetiole, impressed secondary veins and round base F detail of the amplexicaulous leaf-blade base of T. seubertiana G blade of T. tenella, showing the distinctively subpetiolate leaf and strongly asymmetric base H blade of T. umbraculifera, showing the amplexicaulous base and caudate apex. All photos by M. O. O. Pellegrini, except for C by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure3" httpUri="https://binary.pensoft.net/fig/211896" pageId="5" pageNumber="6">3</figureCitation>
), but always presenting an asymmetric base (Fig.
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Leaf morphology in Tradescantia subg. Austrotradescantia. A elliptic blade of T. cerinthoides, showing the dark green colouration and obtuse apex B broadly ovate blade of T. cymbispatha, showing the bluish-green colouration, vinaceous margins, the densely strigose indumentum and cordate base C linear blade of T. decora, showing the conduplicate and falcate posture and truncate base D one of the uppermost leaves from T. fluminensis, showing the dark green colouration, inconspicuous subpetiole, impressed secondary veins and cordate base E blade of T. mundula, showing the short subpetiole, impressed secondary veins and round base F detail of the amplexicaulous leaf-blade base of T. seubertiana G blade of T. tenella, showing the distinctively subpetiolate leaf and strongly asymmetric base H blade of T. umbraculifera, showing the amplexicaulous base and caudate apex. All photos by M. O. O. Pellegrini, except for C by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure3" httpUri="https://binary.pensoft.net/fig/211896" pageId="5" pageNumber="6">3</figureCitation>
). The blades tend to decrease in overall size towards the apex of the stem, while subpetioles decrease in length. Alternatively, the basal-most leaves tend to possess wider bases when compared to the leaves towards the apex of the stem. Subpetioles are restricted to some species in the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="5" pageNumber="6" rank="species" species="fluminensis">
<emphasis italics="true" pageId="5" pageNumber="6">T. fluminensis</emphasis>
</taxonomicName>
group, with sessile leaves being plesiomorphic in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="" order="Liliales" pageId="5" pageNumber="6" rank="family">Commelinaceae</taxonomicName>
(
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). The apex of the leaf-blades is generally acute but can also range from acute to caudate or obtuse (Fig.
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Leaf morphology in Tradescantia subg. Austrotradescantia. A elliptic blade of T. cerinthoides, showing the dark green colouration and obtuse apex B broadly ovate blade of T. cymbispatha, showing the bluish-green colouration, vinaceous margins, the densely strigose indumentum and cordate base C linear blade of T. decora, showing the conduplicate and falcate posture and truncate base D one of the uppermost leaves from T. fluminensis, showing the dark green colouration, inconspicuous subpetiole, impressed secondary veins and cordate base E blade of T. mundula, showing the short subpetiole, impressed secondary veins and round base F detail of the amplexicaulous leaf-blade base of T. seubertiana G blade of T. tenella, showing the distinctively subpetiolate leaf and strongly asymmetric base H blade of T. umbraculifera, showing the amplexicaulous base and caudate apex. All photos by M. O. O. Pellegrini, except for C by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure3" httpUri="https://binary.pensoft.net/fig/211896" pageId="5" pageNumber="6">3</figureCitation>
). The base of the leaf-blades can
<pageBreakToken pageId="6" pageNumber="7" start="start">range</pageBreakToken>
from cuneate to obtuse to cordate or from truncate to amplexicaulous (Fig.
<figureCitation captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Leaf morphology in Tradescantia subg. Austrotradescantia. A elliptic blade of T. cerinthoides, showing the dark green colouration and obtuse apex B broadly ovate blade of T. cymbispatha, showing the bluish-green colouration, vinaceous margins, the densely strigose indumentum and cordate base C linear blade of T. decora, showing the conduplicate and falcate posture and truncate base D one of the uppermost leaves from T. fluminensis, showing the dark green colouration, inconspicuous subpetiole, impressed secondary veins and cordate base E blade of T. mundula, showing the short subpetiole, impressed secondary veins and round base F detail of the amplexicaulous leaf-blade base of T. seubertiana G blade of T. tenella, showing the distinctively subpetiolate leaf and strongly asymmetric base H blade of T. umbraculifera, showing the amplexicaulous base and caudate apex. All photos by M. O. O. Pellegrini, except for C by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure3" httpUri="https://binary.pensoft.net/fig/211896" pageId="6" pageNumber="7">3</figureCitation>
). Finally, the ptyxis can either be convolute or involute, with convolute leaves being restricted to the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="6" pageNumber="7" rank="species" species="crassula">
<emphasis italics="true" pageId="6" pageNumber="7">T. crassula</emphasis>
</taxonomicName>
group and involute leaves restricted to the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="6" pageNumber="7" rank="species" species="fluminensis">
<emphasis italics="true" pageId="6" pageNumber="7">T. fluminensis</emphasis>
</taxonomicName>
group.
</paragraph>
<caption ID-Zenodo-Dep="1305551" doi="10.3897/phytokeys.101.25057.figure3" httpUri="https://binary.pensoft.net/fig/211896" pageId="6" pageNumber="7" start="Figure 3" startId="F3">
<paragraph pageId="6" pageNumber="7">
<emphasis bold="true" pageId="6" pageNumber="7">Figure 3.</emphasis>
Leaf morphology in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="6" pageNumber="7" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
.
<emphasis bold="true" pageId="6" pageNumber="7">A</emphasis>
elliptic blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="6" pageNumber="7" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="6" pageNumber="7">T. cerinthoides</emphasis>
</taxonomicName>
, showing the dark green colouration and obtuse apex
<emphasis bold="true" pageId="6" pageNumber="7">B</emphasis>
broadly ovate blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="6" pageNumber="7" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="6" pageNumber="7">T. cymbispatha</emphasis>
</taxonomicName>
, showing the bluish-green colouration, vinaceous margins, the densely strigose indumentum and cordate base
<emphasis bold="true" pageId="6" pageNumber="7">C</emphasis>
linear blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="6" pageNumber="7" rank="species" species="decora">
<emphasis italics="true" pageId="6" pageNumber="7">T. decora</emphasis>
</taxonomicName>
, showing the conduplicate and falcate posture and truncate base
<emphasis bold="true" pageId="6" pageNumber="7">D</emphasis>
one of the uppermost leaves from
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="6" pageNumber="7" rank="species" species="fluminensis">
<emphasis italics="true" pageId="6" pageNumber="7">T. fluminensis</emphasis>
</taxonomicName>
, showing the dark green colouration, inconspicuous subpetiole, impressed secondary veins and cordate base
<emphasis bold="true" pageId="6" pageNumber="7">E</emphasis>
blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="6" pageNumber="7" rank="species" species="mundula">
<emphasis italics="true" pageId="6" pageNumber="7">T. mundula</emphasis>
</taxonomicName>
, showing the short subpetiole, impressed secondary veins and round base
<emphasis bold="true" pageId="6" pageNumber="7">F</emphasis>
detail of the amplexicaulous leaf-blade base of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="6" pageNumber="7" rank="species" species="seubertiana">
<emphasis italics="true" pageId="6" pageNumber="7">T. seubertiana</emphasis>
</taxonomicName>
<emphasis bold="true" pageId="6" pageNumber="7">G</emphasis>
blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="6" pageNumber="7" rank="species" species="tenella">
<emphasis italics="true" pageId="6" pageNumber="7">T. tenella</emphasis>
</taxonomicName>
, showing the distinctively subpetiolate leaf and strongly asymmetric base
<emphasis bold="true" pageId="6" pageNumber="7">H</emphasis>
blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. umbraculifera" order="Liliales" pageId="6" pageNumber="7" rank="species" species="umbraculifera">
<emphasis italics="true" pageId="6" pageNumber="7">T. umbraculifera</emphasis>
</taxonomicName>
, showing the amplexicaulous base and caudate apex. All photos by M.O.O. Pellegrini, except for
<emphasis bold="true" pageId="6" pageNumber="7">C</emphasis>
by H.M.
<normalizedToken originalValue="Bünecker">Buenecker</normalizedToken>
.
</paragraph>
</caption>
</subSubSection>
<subSubSection lastPageId="7" lastPageNumber="8" pageId="6" pageNumber="7" type="variegation">
<paragraph pageId="6" pageNumber="7">Variegation.</paragraph>
<paragraph lastPageId="7" lastPageNumber="8" pageId="6" pageNumber="7">
Striped leaves have long been observed, described and utilised for species delimitation in the family. In some species (e.g.
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. soconuscana" order="Liliales" pageId="6" pageNumber="7" rank="species" species="soconuscana">
<emphasis italics="true" pageId="6" pageNumber="7">T. soconuscana</emphasis>
</taxonomicName>
Matuda and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. zebrina" order="Liliales" pageId="7" pageNumber="8" rank="species" species="zebrina">
<emphasis italics="true" pageId="7" pageNumber="8">
<pageBreakToken pageId="7" pageNumber="8" start="start">T</pageBreakToken>
. zebrina
</emphasis>
</taxonomicName>
Heynh.
<emphasis italics="true" pageId="7" pageNumber="8">ex</emphasis>
Bosse and their relatives), it is a marking feature that greatly aids their recognition (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). According to my anatomical observations and ongoing studies on the matter, the silver stripes in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="" order="Liliales" pageId="7" pageNumber="8" rank="family">Commelinaceae</taxonomicName>
seem to consist of aerenchymatous tissue that might help understorey plants increase the amount of light they are able to absorb, by directing light through reflection to the inside of the chlorophyllate parenchyma (unpublished data). Nonetheless, this feature has been observed not to be constant in most taxa of the family, being environmentally controlled in at least
<taxonomicName authorityName="C.B.Clarke" authorityYear="1881" class="Liliopsida" family="Commelinaceae" genus="Buforrestia" higherTaxonomySource="GBIF,CoL" kingdom="Plantae" lsidName="Buforrestia" order="Commelinales" pageId="7" pageNumber="8" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Buforrestia</emphasis>
</taxonomicName>
C.B.Clarke,
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Dichorisandra" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Dichorisandra" order="Commelinales" pageId="7" pageNumber="8" phylum="Liliopsida" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Dichorisandra</emphasis>
</taxonomicName>
J.C.Mikan,
<taxonomicName authorityName="Loureiro" authorityYear="1790" class="Monocotyledoneae" family="Commelinaceae" genus="Floscopa" higherTaxonomySource="GBIF" kingdom="Plantae" lsidName="Floscopa" order="Commelinales" pageId="7" pageNumber="8" phylum="Angiospermae" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Floscopa</emphasis>
</taxonomicName>
Lour.,
<taxonomicName authorityName="R.B.Faden &amp; C.R.Hardy" authorityYear="2004" class="Liliopsida" family="Commelinaceae" genus="Plowmanianthus" higherTaxonomySource="GBIF,CoL" kingdom="Plantae" lsidName="Plowmanianthus" order="Commelinales" pageId="7" pageNumber="8" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Plowmanianthus</emphasis>
</taxonomicName>
Faden &amp; C.R.Hardy and
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Siderasis" higherTaxonomySource="GBIF,CoL" kingdom="Plantae" lsidName="Siderasis" order="Commelinales" pageId="7" pageNumber="8" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Siderasis</emphasis>
</taxonomicName>
Raf. emend. M.Pell. &amp; Faden (pers. observ.). In
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="7" pageNumber="8" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Tradescantia</emphasis>
</taxonomicName>
, this feature seems to be phylogenetically related (at least to some degree), since it is only known to occur in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Campelia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Campelia">T. subg. Campelia</taxonomicName>
(
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). In
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, a myriad of cultivars of several species are known for their variegated leaves (e.g.
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="7" pageNumber="8" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="7" pageNumber="8">T. cerinthoides</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="7" pageNumber="8" rank="species" species="decora">
<emphasis italics="true" pageId="7" pageNumber="8">T. decora</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="7" pageNumber="8" rank="species" species="fluminensis">
<emphasis italics="true" pageId="7" pageNumber="8">T. fluminensis</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="7" pageNumber="8" rank="species" species="mundula">
<emphasis italics="true" pageId="7" pageNumber="8">T. mundula</emphasis>
</taxonomicName>
; Fig.
<figureCitation captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Leaf variegation in Tradescantia subg. Austrotradescantia cultivars A habit of T. fluminensis, showing different degrees of yellow variegation in the same plant B sick leaf blade of T. decora, showing the white variegation and a necrotic spot C-D T. fluminensis with yellow variegation C sick branch, showing atrophied and almost completely lacking chlorophyll D sick leaf blade, showing small portions of chlorophyllate tissue and necrotic spots. E-H, T. mundula with pink to vinaceous variegation E habit, showing different variegation patterns and degrees in the same plant F healthy branch, showing leaves with stripes in shades of pink and lilac G sick branch, showing the almost complete lack of chlorophyll and the great amount anthocyanin on the abaxial side of the blades H sick branch, showing the almost complete lack of chlorophyll and the pink hue produced by the anthocyanin from the abaxial side of the blades. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure4" httpUri="https://binary.pensoft.net/fig/211897" pageId="7" pageNumber="8">4</figureCitation>
), but also found in members of different subgenera [e.g.
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. spathacea" order="Liliales" pageId="7" pageNumber="8" rank="species" species="spathacea">
<emphasis italics="true" pageId="7" pageNumber="8">T. spathacea</emphasis>
</taxonomicName>
Sw.,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. zanonia" order="Liliales" pageId="7" pageNumber="8" rank="species" species="zanonia">
<emphasis italics="true" pageId="7" pageNumber="8">T. zanonia</emphasis>
</taxonomicName>
(L.) Sw. and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. zebrina" order="Liliales" pageId="7" pageNumber="8" rank="species" species="zebrina">
<emphasis italics="true" pageId="7" pageNumber="8">T. zebrina</emphasis>
</taxonomicName>
-
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Campelia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Campelia">T. subg. Campelia</taxonomicName>
-,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. pallida" order="Liliales" pageId="7" pageNumber="8" rank="species" species="pallida">
<emphasis italics="true" pageId="7" pageNumber="8">T. pallida</emphasis>
</taxonomicName>
(Rose) D.R.Hunt and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. sillamontana" order="Liliales" pageId="7" pageNumber="8" rank="species" species="sillamontana">
<emphasis italics="true" pageId="7" pageNumber="8">T. sillamontana</emphasis>
</taxonomicName>
Matuda -
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Setcreasea) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Setcreasea">T. subg. Setcreasea</taxonomicName>
-, but it is unknown to me to occur in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Mandonia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Mandonia">T. subg. Mandonia</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Tradescantia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Tradescantia">T. subg. Tradescantia</taxonomicName>
; pers. observ.]. However, this variegation does not seem to be homologous to the silver stripes commonly observed in other members of the family. These stripes do not seem to be produced by the concentration of aerenchymatous tissue, but actually seem to be caused by the loss of pigmentation in the leaves. They actually look similar to the symptoms caused by some strains of the tulip breaking virus (family
<taxonomicName family="Potyviridae" higherTaxonomySource="CoL" kingdom="Viruses" lsidName="" pageId="7" pageNumber="8" rank="family">Potyviridae</taxonomicName>
) in the perianth of
<taxonomicName kingdom="Plantae" lsidName="" order="Liliales" pageId="7" pageNumber="8" rank="order">Liliales</taxonomicName>
(
<bibRefCitation author="McKay, MB" journalOrPublisher="National Horticultural Magazine" pageId="59" pageNumber="60" pagination="179 - 213" refId="B30" refString="McKay, MB, Warner, MF, 1933. Historical sketch of tulip mosaic or breaking, the oldest known plant virus disease. National Horticultural Magazine 12: 179 - 213" title="Historical sketch of tulip mosaic or breaking, the oldest known plant virus disease." volume="12" year="1933">McKay and Warner 1933</bibRefCitation>
;
<bibRefCitation DOI="https://doi.org/10.1111/j.1744-7348.1938.tb02333.x" author="McWhorter, FP" journalOrPublisher="Annals of Applied Biology" pageId="59" pageNumber="60" pagination="245 - 270" refId="B31" refString="McWhorter, FP, 1938. The antithetic virus theory of tulip-breaking. Annals of Applied Biology 25: 245 - 270, DOI: https://doi.org/10.1111/j.1744-7348.1938.tb02333.x" title="The antithetic virus theory of tulip-breaking." url="https://doi.org/10.1111/j.1744-7348.1938.tb02333.x" volume="25" year="1938">McWhorter 1938</bibRefCitation>
) and more precisely to symptoms caused the commelina yellow mottle virus (
<taxonomicName class="Revtraviricetes" family="Caulimoviridae" genus="Badnavirus" higherTaxonomySource="CoL" kingdom="Pararnavirae" lsidName="Badnavirus" order="Ortervirales" pageId="7" pageNumber="8" phylum="Artverviricota" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Badnavirus</emphasis>
</taxonomicName>
spp., family
<taxonomicName family="Caulimoviridae" higherTaxonomySource="CoL" kingdom="Viruses" lsidName="" pageId="7" pageNumber="8" rank="family">Caulimoviridae</taxonomicName>
), being generally malefic to the infected plants (
<bibRefCitation DOI="https://doi.org/10.1002/9780470015902.a0000746.pub2" author="Hull, R" editor="Geering, AD" journalOrPublisher="John Wiley &amp; Sons" pageId="58" pageNumber="59" pagination="1 - 8" refId="B19" refString="Hull, R, 2007. Caulimoviridae (Plant Pararetroviruses). In: Geering, AD, Ed., Encyclopedia of Life Sciences. John Wiley &amp; Sons: 1 - 8, DOI: https://doi.org/10.1002/9780470015902.a0000746.pub2" title="Caulimoviridae (Plant Pararetroviruses)." url="https://doi.org/10.1002/9780470015902.a0000746.pub2" volumeTitle="Encyclopedia of Life Sciences." year="2007">Hull 2007</bibRefCitation>
;
<bibRefCitation DOI="http://dx.doi.org/10.1094/PDIS-11-11-0928-FE" author="Valverde, RA" journalOrPublisher="Harper &amp; Row Publishers, New York" pageId="60" pageNumber="61" refId="B49" refString="Valverde, RA, Sabanadzovic, S, Hammond, J, 2012. Viruses that Enhance the Aesthetics of Some Ornamental Plants: Beauty or Beast? Plant Disease 96(5): 600-611. http://dx.doi.org/10.1094/PDIS-11-11-0928-FE" title="Viruses that Enhance the Aesthetics of Some Ornamental Plants: Beauty or Beast? Plant Disease 96 (5): 600 - 611." url="http://dx.doi.org/10.1094/PDIS-11-11-0928-FE" year="2012">Valverde et al. 2012</bibRefCitation>
). These white stripes (sometimes also yellow or pink to vinaceous, due to the presence of secondary pigments; Fig.
<figureCitation captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Leaf variegation in Tradescantia subg. Austrotradescantia cultivars A habit of T. fluminensis, showing different degrees of yellow variegation in the same plant B sick leaf blade of T. decora, showing the white variegation and a necrotic spot C-D T. fluminensis with yellow variegation C sick branch, showing atrophied and almost completely lacking chlorophyll D sick leaf blade, showing small portions of chlorophyllate tissue and necrotic spots. E-H, T. mundula with pink to vinaceous variegation E habit, showing different variegation patterns and degrees in the same plant F healthy branch, showing leaves with stripes in shades of pink and lilac G sick branch, showing the almost complete lack of chlorophyll and the great amount anthocyanin on the abaxial side of the blades H sick branch, showing the almost complete lack of chlorophyll and the pink hue produced by the anthocyanin from the abaxial side of the blades. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure4" httpUri="https://binary.pensoft.net/fig/211897" pageId="7" pageNumber="8">4</figureCitation>
) are not commonly observed in natural populations, being almost exclusively recorded in cultivated plants (pers. observ.). During cultivation in the greenhouses of the Jardim
<normalizedToken originalValue="Botânico">Botanico</normalizedToken>
do Rio de Janeiro, some specimens not originally striped, were observed to acquire such features. The appearance of white to yellow stripes in the leaves occurred shortly after a great aphid and mealybug infestation struck the live collection. Specimens from different genera, such as
<taxonomicName class="Monocotyledoneae" family="Commelinaceae" genus="Commelina" higherTaxonomySource="GBIF" kingdom="Plantae" lsidName="Commelina" order="Commelinales" pageId="7" pageNumber="8" phylum="Angiospermae" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Commelina</emphasis>
</taxonomicName>
and
<taxonomicName authorityName="Loureiro" authorityYear="1790" class="Monocotyledoneae" family="Commelinaceae" genus="Floscopa" higherTaxonomySource="GBIF" kingdom="Plantae" lsidName="Floscopa" order="Commelinales" pageId="7" pageNumber="8" phylum="Angiospermae" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Floscopa</emphasis>
</taxonomicName>
also acquired such stripes. After some months, the affected specimens either withered and died or survived and lost the stripes (pers. observ.). This pattern is coherent with the one observed in the transmission and spread of viruses from families
<taxonomicName family="Potyviridae" higherTaxonomySource="CoL" kingdom="Viruses" lsidName="" pageId="7" pageNumber="8" rank="family">Potyviridae</taxonomicName>
,
<taxonomicName family="Caulimoviridae" higherTaxonomySource="CoL" kingdom="Viruses" lsidName="" pageId="7" pageNumber="8" rank="family">Caulimoviridae</taxonomicName>
and other plant infecting families that cause mosaic and breaking patterns in plants (
<bibRefCitation author="McKay, MB" journalOrPublisher="National Horticultural Magazine" pageId="59" pageNumber="60" pagination="179 - 213" refId="B30" refString="McKay, MB, Warner, MF, 1933. Historical sketch of tulip mosaic or breaking, the oldest known plant virus disease. National Horticultural Magazine 12: 179 - 213" title="Historical sketch of tulip mosaic or breaking, the oldest known plant virus disease." volume="12" year="1933">McKay and Warner 1933</bibRefCitation>
;
<bibRefCitation DOI="https://doi.org/10.1111/j.1744-7348.1938.tb02333.x" author="McWhorter, FP" journalOrPublisher="Annals of Applied Biology" pageId="59" pageNumber="60" pagination="245 - 270" refId="B31" refString="McWhorter, FP, 1938. The antithetic virus theory of tulip-breaking. Annals of Applied Biology 25: 245 - 270, DOI: https://doi.org/10.1111/j.1744-7348.1938.tb02333.x" title="The antithetic virus theory of tulip-breaking." url="https://doi.org/10.1111/j.1744-7348.1938.tb02333.x" volume="25" year="1938">McWhorter 1938</bibRefCitation>
;
<bibRefCitation author="Andret-Link, P" journalOrPublisher="Journal of Plant Pathology" pageId="57" pageNumber="58" pagination="153 - 165" refId="B2" refString="Andret-Link, P, Fuchs, M, 2005. Transmission specificity of plant viruses by vectors. Journal of Plant Pathology 87 (3): 153 - 165" title="Transmission specificity of plant viruses by vectors." volume="87" year="2005">Andret-Link and Fuchs 2005</bibRefCitation>
;
<bibRefCitation DOI="https://doi.org/10.1002/9780470015902.a0000746.pub2" author="Hull, R" editor="Geering, AD" journalOrPublisher="John Wiley &amp; Sons" pageId="58" pageNumber="59" pagination="1 - 8" refId="B19" refString="Hull, R, 2007. Caulimoviridae (Plant Pararetroviruses). In: Geering, AD, Ed., Encyclopedia of Life Sciences. John Wiley &amp; Sons: 1 - 8, DOI: https://doi.org/10.1002/9780470015902.a0000746.pub2" title="Caulimoviridae (Plant Pararetroviruses)." url="https://doi.org/10.1002/9780470015902.a0000746.pub2" volumeTitle="Encyclopedia of Life Sciences." year="2007">Hull 2007</bibRefCitation>
;
<bibRefCitation DOI="http://dx.doi.org/10.1094/PDIS-11-11-0928-FE" author="Valverde, RA" journalOrPublisher="Harper &amp; Row Publishers, New York" pageId="60" pageNumber="61" refId="B49" refString="Valverde, RA, Sabanadzovic, S, Hammond, J, 2012. Viruses that Enhance the Aesthetics of Some Ornamental Plants: Beauty or Beast? Plant Disease 96(5): 600-611. http://dx.doi.org/10.1094/PDIS-11-11-0928-FE" title="Viruses that Enhance the Aesthetics of Some Ornamental Plants: Beauty or Beast? Plant Disease 96 (5): 600 - 611." url="http://dx.doi.org/10.1094/PDIS-11-11-0928-FE" year="2012">Valverde et al. 2012</bibRefCitation>
). Thus, in the present study, striped specimens of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
are disregarded, being considered merely as sick plants or artificially selected morphotypes of no taxonomic relevance.
</paragraph>
<caption ID-Zenodo-Dep="1305561" doi="10.3897/phytokeys.101.25057.figure4" httpUri="https://binary.pensoft.net/fig/211897" pageId="7" pageNumber="8" start="Figure 4" startId="F4">
<paragraph pageId="7" pageNumber="8">
<emphasis bold="true" pageId="7" pageNumber="8">Figure 4.</emphasis>
Leaf variegation in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="7" pageNumber="8" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
cultivars
<emphasis bold="true" pageId="7" pageNumber="8">A</emphasis>
habit of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="7" pageNumber="8" rank="species" species="fluminensis">
<emphasis italics="true" pageId="7" pageNumber="8">T. fluminensis</emphasis>
</taxonomicName>
, showing different degrees of yellow variegation in the same plant
<emphasis bold="true" pageId="7" pageNumber="8">B</emphasis>
sick leaf blade of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="7" pageNumber="8" rank="species" species="decora">
<emphasis italics="true" pageId="7" pageNumber="8">T. decora</emphasis>
</taxonomicName>
, showing the white variegation and a necrotic spot
<emphasis bold="true" pageId="7" pageNumber="8">C-D</emphasis>
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="7" pageNumber="8" rank="species" species="fluminensis">
<emphasis italics="true" pageId="7" pageNumber="8">T. fluminensis</emphasis>
</taxonomicName>
with yellow variegation
<emphasis bold="true" pageId="7" pageNumber="8">C</emphasis>
sick branch, showing atrophied and almost completely lacking chlorophyll
<emphasis bold="true" pageId="7" pageNumber="8">D</emphasis>
sick leaf blade, showing small portions of chlorophyllate tissue and necrotic spots.
<emphasis bold="true" pageId="7" pageNumber="8">E-H</emphasis>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="7" pageNumber="8" rank="species" species="mundula">
<emphasis italics="true" pageId="7" pageNumber="8">T. mundula</emphasis>
</taxonomicName>
with pink to vinaceous variegation
<emphasis bold="true" pageId="7" pageNumber="8">E</emphasis>
habit, showing different variegation patterns and degrees in the same plant
<emphasis bold="true" pageId="7" pageNumber="8">F</emphasis>
healthy branch, showing leaves with stripes in shades of pink and lilac
<emphasis bold="true" pageId="7" pageNumber="8">G</emphasis>
sick branch, showing the almost complete lack of chlorophyll and the great amount anthocyanin on the abaxial side of the blades
<emphasis bold="true" pageId="7" pageNumber="8">H</emphasis>
sick branch, showing the almost complete lack of chlorophyll and the pink hue produced by the anthocyanin from the abaxial side of the blades. Photos by M.O.O. Pellegrini.
</paragraph>
</caption>
</subSubSection>
<subSubSection lastPageId="8" lastPageNumber="9" pageId="7" pageNumber="8" type="inflorescences">
<paragraph pageId="7" pageNumber="8">Inflorescences.</paragraph>
<paragraph lastPageId="8" lastPageNumber="9" pageId="7" pageNumber="8">
The inflorescence architecture in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="7" pageNumber="8" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
follows the double-cincinni pattern, as described by
<bibRefCitation DOI="https://doi.org/10.1016/j.flora.2010.07.003" author="Panigo, E" journalOrPublisher="Flora" pageId="59" pageNumber="60" pagination="294 - 299" refId="B34" refString="Panigo, E, Ramos, J, Lucero, L, Perreta, M, Vegetti, A, 2011. The inflorescence in Commelinaceae. Flora 206 (4): 294 - 299, DOI: https://doi.org/10.1016/j.flora.2010.07.003" title="The inflorescence in Commelinaceae." url="https://doi.org/10.1016/j.flora.2010.07.003" volume="206" year="2011">Panigo et al. (2011)</bibRefCitation>
and indicated by
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini (2017)</bibRefCitation>
as characteristic to
<taxonomicName class="Monocotyledoneae" family="Commelinaceae" genus="Callisia" higherTaxonomySource="GBIF" kingdom="Plantae" lsidName="Callisia" order="Commelinales" pageId="7" pageNumber="8" phylum="Angiospermae" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Callisia</emphasis>
</taxonomicName>
<emphasis italics="true" pageId="7" pageNumber="8">s.l.</emphasis>
,
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="7" pageNumber="8" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Tradescantia</emphasis>
</taxonomicName>
and
<taxonomicName class="Monocotyledoneae" family="Commelinaceae" genus="Tripogandra" higherTaxonomySource="GBIF" kingdom="Plantae" lsidName="Tripogandra" order="Commelinales" pageId="7" pageNumber="8" phylum="Angiospermae" rank="genus">
<emphasis italics="true" pageId="7" pageNumber="8">Tripogandra</emphasis>
</taxonomicName>
<emphasis italics="true" pageId="7" pageNumber="8">s.l.</emphasis>
The cincinni bracts are always frondose, being leaf-like in most species but spathaceous in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="7" pageNumber="8" rank="species" species="decora">
<emphasis italics="true" pageId="7" pageNumber="8">T. decora</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. umbraculifera" order="Liliales" pageId="7" pageNumber="8" rank="species" species="umbraculifera">
<emphasis italics="true" pageId="7" pageNumber="8">T. umbraculifera</emphasis>
</taxonomicName>
(Fig.
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Inflorescence architecture in Tradescantia subg. Austrotradescantia A malformed main florescence of T. cymbispatha, showing the subopposite cincinni B detail of the synflorescence of T. crassula, showing an axillary inflorescence composed of solitary cincinnus and a terminal with the typical double-cincinni with non-saccate cincinni bracts C-D inflorescence in T. decora C inflorescence composed of 4 - cincinni, showing the spathaceous and supernumerary bracts D synflorescence, showing main florescences and coflorescences ranging from regular double-cincinni to 3 - 5 - cincinni E front view of the main florescence of T. fluminensis, showing the saccate cincinni bracts F dorsal view of the main florescence of T. mundula, showing the saccate cincinni bracts G main florescence of T. seubertiana, showing the unequal and non-saccate cincinni bracts H main florescence of T. tenella, showing the strongly unequal cincinni bracts I inflorescence of T. umbraculifera, showing the main florescence and a coflorescence emerging from the same leaf axil. All photos by M. O. O. Pellegrini, except C-D by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure5" httpUri="https://binary.pensoft.net/fig/211898" pageId="7" pageNumber="8">5C, D, I</figureCitation>
). The base of the cincinni bracts can
<pageBreakToken pageId="8" pageNumber="9" start="start">be</pageBreakToken>
saccate or not, with saccate bracts being synapomorphic to the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="8" pageNumber="9" rank="species" species="fluminensis">
<emphasis italics="true" pageId="8" pageNumber="9">T. fluminensis</emphasis>
</taxonomicName>
group (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Supernumerary bracts are rare in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, being exclusively recorded for
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="8" pageNumber="9" rank="species" species="decora">
<emphasis italics="true" pageId="8" pageNumber="9">T. decora</emphasis>
</taxonomicName>
. The cincinni are always sessile, contracted and fused back to back. Due to great reduction in the main florescence, the cincinni seem opposite in most specimens. Nonetheless, in some specimens, a malformation in the inflorescence can cause the internodes between the cincinni to elongate, thus producing subopposite cincinni (Fig.
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Inflorescence architecture in Tradescantia subg. Austrotradescantia A malformed main florescence of T. cymbispatha, showing the subopposite cincinni B detail of the synflorescence of T. crassula, showing an axillary inflorescence composed of solitary cincinnus and a terminal with the typical double-cincinni with non-saccate cincinni bracts C-D inflorescence in T. decora C inflorescence composed of 4 - cincinni, showing the spathaceous and supernumerary bracts D synflorescence, showing main florescences and coflorescences ranging from regular double-cincinni to 3 - 5 - cincinni E front view of the main florescence of T. fluminensis, showing the saccate cincinni bracts F dorsal view of the main florescence of T. mundula, showing the saccate cincinni bracts G main florescence of T. seubertiana, showing the unequal and non-saccate cincinni bracts H main florescence of T. tenella, showing the strongly unequal cincinni bracts I inflorescence of T. umbraculifera, showing the main florescence and a coflorescence emerging from the same leaf axil. All photos by M. O. O. Pellegrini, except C-D by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure5" httpUri="https://binary.pensoft.net/fig/211898" pageId="8" pageNumber="9">5A</figureCitation>
;
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Most inflorescences are composed of two cincinni, as the double-cincinni architecture would suggest. Nonetheless, some exceptions are recorded, with
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="8" pageNumber="9" rank="species" species="crassula">
<emphasis italics="true" pageId="8" pageNumber="9">T. crassula</emphasis>
</taxonomicName>
producing perfect double-cincinni, but also commonly producing axillary inflorescences composed of a solitary cincinnus (Fig.
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Inflorescence architecture in Tradescantia subg. Austrotradescantia A malformed main florescence of T. cymbispatha, showing the subopposite cincinni B detail of the synflorescence of T. crassula, showing an axillary inflorescence composed of solitary cincinnus and a terminal with the typical double-cincinni with non-saccate cincinni bracts C-D inflorescence in T. decora C inflorescence composed of 4 - cincinni, showing the spathaceous and supernumerary bracts D synflorescence, showing main florescences and coflorescences ranging from regular double-cincinni to 3 - 5 - cincinni E front view of the main florescence of T. fluminensis, showing the saccate cincinni bracts F dorsal view of the main florescence of T. mundula, showing the saccate cincinni bracts G main florescence of T. seubertiana, showing the unequal and non-saccate cincinni bracts H main florescence of T. tenella, showing the strongly unequal cincinni bracts I inflorescence of T. umbraculifera, showing the main florescence and a coflorescence emerging from the same leaf axil. All photos by M. O. O. Pellegrini, except C-D by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure5" httpUri="https://binary.pensoft.net/fig/211898" pageId="8" pageNumber="9">5B</figureCitation>
;
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Furthermore,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="8" pageNumber="9" rank="species" species="decora">
<emphasis italics="true" pageId="8" pageNumber="9">T. decora</emphasis>
</taxonomicName>
is the only species in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
to regularly present main florescences with more than two cincinni, generally producing main florescences with 2-3(-5) cincinni (Fig.
<figureCitation captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Inflorescence architecture in Tradescantia subg. Austrotradescantia A malformed main florescence of T. cymbispatha, showing the subopposite cincinni B detail of the synflorescence of T. crassula, showing an axillary inflorescence composed of solitary cincinnus and a terminal with the typical double-cincinni with non-saccate cincinni bracts C-D inflorescence in T. decora C inflorescence composed of 4 - cincinni, showing the spathaceous and supernumerary bracts D synflorescence, showing main florescences and coflorescences ranging from regular double-cincinni to 3 - 5 - cincinni E front view of the main florescence of T. fluminensis, showing the saccate cincinni bracts F dorsal view of the main florescence of T. mundula, showing the saccate cincinni bracts G main florescence of T. seubertiana, showing the unequal and non-saccate cincinni bracts H main florescence of T. tenella, showing the strongly unequal cincinni bracts I inflorescence of T. umbraculifera, showing the main florescence and a coflorescence emerging from the same leaf axil. All photos by M. O. O. Pellegrini, except C-D by H. M. Buenecker." figureDoi="10.3897/phytokeys.101.25057.figure5" httpUri="https://binary.pensoft.net/fig/211898" pageId="8" pageNumber="9">5C, D</figureCitation>
;
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
).
</paragraph>
<caption ID-Zenodo-Dep="1305563" doi="10.3897/phytokeys.101.25057.figure5" httpUri="https://binary.pensoft.net/fig/211898" pageId="8" pageNumber="9" start="Figure 5" startId="F5">
<paragraph pageId="8" pageNumber="9">
<emphasis bold="true" pageId="8" pageNumber="9">Figure 5.</emphasis>
Inflorescence architecture in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="8" pageNumber="9" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
<emphasis bold="true" pageId="8" pageNumber="9">A</emphasis>
malformed main florescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="8" pageNumber="9" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="8" pageNumber="9">T. cymbispatha</emphasis>
</taxonomicName>
, showing the subopposite cincinni
<emphasis bold="true" pageId="8" pageNumber="9">B</emphasis>
detail of the synflorescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="8" pageNumber="9" rank="species" species="crassula">
<emphasis italics="true" pageId="8" pageNumber="9">T. crassula</emphasis>
</taxonomicName>
, showing an axillary inflorescence composed of solitary cincinnus and a terminal with the typical double-cincinni with non-saccate cincinni bracts
<emphasis bold="true" pageId="8" pageNumber="9">C-D</emphasis>
inflorescence in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="8" pageNumber="9" rank="species" species="decora">
<emphasis italics="true" pageId="8" pageNumber="9">T. decora</emphasis>
</taxonomicName>
<emphasis bold="true" pageId="8" pageNumber="9">C</emphasis>
inflorescence composed of 4-cincinni, showing the spathaceous and supernumerary bracts
<emphasis bold="true" pageId="8" pageNumber="9">D</emphasis>
synflorescence, showing main florescences and coflorescences ranging from regular double-cincinni to 3-5-cincinni
<emphasis bold="true" pageId="8" pageNumber="9">E</emphasis>
front view of the main florescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="8" pageNumber="9" rank="species" species="fluminensis">
<emphasis italics="true" pageId="8" pageNumber="9">T. fluminensis</emphasis>
</taxonomicName>
, showing the saccate cincinni bracts
<emphasis bold="true" pageId="8" pageNumber="9">F</emphasis>
dorsal view of the main florescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. mundula" order="Liliales" pageId="8" pageNumber="9" rank="species" species="mundula">
<emphasis italics="true" pageId="8" pageNumber="9">T. mundula</emphasis>
</taxonomicName>
, showing the saccate cincinni bracts
<emphasis bold="true" pageId="8" pageNumber="9">G</emphasis>
main florescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="8" pageNumber="9" rank="species" species="seubertiana">
<emphasis italics="true" pageId="8" pageNumber="9">T. seubertiana</emphasis>
</taxonomicName>
, showing the unequal and non-saccate cincinni bracts
<emphasis bold="true" pageId="8" pageNumber="9">H</emphasis>
main florescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="8" pageNumber="9" rank="species" species="tenella">
<emphasis italics="true" pageId="8" pageNumber="9">T. tenella</emphasis>
</taxonomicName>
, showing the strongly unequal cincinni bracts
<emphasis bold="true" pageId="8" pageNumber="9">I</emphasis>
inflorescence of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. umbraculifera" order="Liliales" pageId="8" pageNumber="9" rank="species" species="umbraculifera">
<emphasis italics="true" pageId="8" pageNumber="9">T. umbraculifera</emphasis>
</taxonomicName>
, showing the main florescence and a coflorescence emerging from the same leaf axil. All photos by M.O.O. Pellegrini, except
<emphasis bold="true" pageId="8" pageNumber="9">C-D</emphasis>
by H.M.
<normalizedToken originalValue="Bünecker">Buenecker</normalizedToken>
.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="8" pageNumber="9" type="flowers">
<paragraph pageId="8" pageNumber="9">Flowers.</paragraph>
<paragraph pageId="8" pageNumber="9">
The flowers in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
are always flat (i.e. not forming a floral tube), with flowers being held in an upright position at pre-anthesis and anthesis and later acquiring a deflexed position at post-anthesis and fruiting (Fig.
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Floral morphology in Tradescantia subg. Austrotradescantia. A-C floral buds A floral bud of T. cerinthoides, showing the vinaceous coloration, densely hispid indumentum and absence of dorsal keels in the sepals B floral bud of T. fluminensis, showing the medium green colouration and pilose eglandular hairs restricted to dorsal keels C floral bud of T. tenella, showing the green colouration, glandular-pubescent indumentum and the presence of dorsal keels in the sepals D-H flowers D front view of a flower of T. atlantica, showing the plicate petals E front view of a flower of T. fluminensis, showing the plicate petals F side view of two flowers of T. fluminensis, showing the plicate petals and the deflexed flowers at post-anthesis G front view of a flower of T. tenella, showing the flat petals H front view of a flower of T. umbraculifera, showing the flat and elliptic petals. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure6" httpUri="https://binary.pensoft.net/fig/211899" pageId="8" pageNumber="9">6F</figureCitation>
;
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). As with the other species of
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="8" pageNumber="9" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="8" pageNumber="9">Tradescantia</emphasis>
</taxonomicName>
, the species of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
possess scentless flowers (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
) and, like all species of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="" order="Liliales" pageId="8" pageNumber="9" rank="family">Commelinaceae</taxonomicName>
, completely lack nectaries of all kinds (Faden 1992). A marking floral conservatism can be easily observed in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, with gross floral morphology presenting little taxonomic relevance for species delimitation in the subgenus (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Some taxonomic relevance can be given to the shape of the floral buds (that can be of great help in differentiating closely related taxa) and floral diameter (which can also help differentiate some species).
</paragraph>
</subSubSection>
<subSubSection pageId="8" pageNumber="9" type="sepals">
<paragraph pageId="8" pageNumber="9">Sepals.</paragraph>
<paragraph pageId="8" pageNumber="9">
Aside from the pubescence, little variation is observed in the sepals of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
. The sepals are always equal, free, chartaceous, ovate, with acute apex. They can range from medium to dark green or from purple to vinaceous to dark vinaceous and can be dorsally keeled or not (Fig.
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Floral morphology in Tradescantia subg. Austrotradescantia. A-C floral buds A floral bud of T. cerinthoides, showing the vinaceous coloration, densely hispid indumentum and absence of dorsal keels in the sepals B floral bud of T. fluminensis, showing the medium green colouration and pilose eglandular hairs restricted to dorsal keels C floral bud of T. tenella, showing the green colouration, glandular-pubescent indumentum and the presence of dorsal keels in the sepals D-H flowers D front view of a flower of T. atlantica, showing the plicate petals E front view of a flower of T. fluminensis, showing the plicate petals F side view of two flowers of T. fluminensis, showing the plicate petals and the deflexed flowers at post-anthesis G front view of a flower of T. tenella, showing the flat petals H front view of a flower of T. umbraculifera, showing the flat and elliptic petals. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure6" httpUri="https://binary.pensoft.net/fig/211899" pageId="8" pageNumber="9">6A-C</figureCitation>
;
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Measures can be of some help, but they do commonly overlap between closely related species.
</paragraph>
</subSubSection>
<subSubSection pageId="8" pageNumber="9" type="petals">
<paragraph pageId="8" pageNumber="9">Petals.</paragraph>
<paragraph pageId="8" pageNumber="9">
The deliquescent petals are also quite homogeneous in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
, being always sessile (i.e. without a claw, like some species of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Campelia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Campelia">T. subg. Campelia</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Mandonia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Mandonia">T. subg. Mandonia</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Setcreasea) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Setcreasea">T. subg. Setcreasea</taxonomicName>
and all species of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Tradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Tradescantia">T. subg. Tradescantia</taxonomicName>
;
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
), equal, free, elliptic to ovate to broadly ovate, with cuneate to obtuse base, glabrous margin and acute apex. Little colour variation is observed, especially when compared with
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Campelia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Campelia">T. subg. Campelia</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Tradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Tradescantia">T. subg. Tradescantia</taxonomicName>
. All species possess predominantly white petals, with the exception of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. seubertiana" order="Liliales" pageId="8" pageNumber="9" rank="species" species="seubertiana">
<emphasis italics="true" pageId="8" pageNumber="9">T. seubertiana</emphasis>
</taxonomicName>
, which always possesses pink petals. Nonetheless, specimens also presenting petals in different hues of pink or lilac can sometimes be observed in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="8" pageNumber="9" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="8" pageNumber="9">T. cerinthoides</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cymbispatha" order="Liliales" pageId="8" pageNumber="9" rank="species" species="cymbispatha">
<emphasis italics="true" pageId="8" pageNumber="9">T. cymbispatha</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. decora" order="Liliales" pageId="8" pageNumber="9" rank="species" species="decora">
<emphasis italics="true" pageId="8" pageNumber="9">T. decora</emphasis>
</taxonomicName>
,
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="8" pageNumber="9" rank="species" species="tenella">
<emphasis italics="true" pageId="8" pageNumber="9">T. tenella</emphasis>
</taxonomicName>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tucumanensis" order="Liliales" pageId="8" pageNumber="9" rank="species" species="tucumanensis">
<emphasis italics="true" pageId="8" pageNumber="9">T. tucumanensis</emphasis>
</taxonomicName>
. Finally, petals in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
can either be flat or plicate. The plicate petals are caused by a fold along the
<normalizedToken originalValue="petals’">petals'</normalizedToken>
midvein and are exclusively found in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. atlantica" order="Liliales" pageId="8" pageNumber="9" rank="species" species="atlantica">
<emphasis italics="true" pageId="8" pageNumber="9">T. atlantica</emphasis>
</taxonomicName>
M.Pell.
<emphasis italics="true" pageId="8" pageNumber="9">sp. nov.</emphasis>
and
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="8" pageNumber="9" rank="species" species="fluminensis">
<emphasis italics="true" pageId="8" pageNumber="9">T. fluminensis</emphasis>
</taxonomicName>
<emphasis italics="true" pageId="8" pageNumber="9">s.s.</emphasis>
(Fig.
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Floral morphology in Tradescantia subg. Austrotradescantia. A-C floral buds A floral bud of T. cerinthoides, showing the vinaceous coloration, densely hispid indumentum and absence of dorsal keels in the sepals B floral bud of T. fluminensis, showing the medium green colouration and pilose eglandular hairs restricted to dorsal keels C floral bud of T. tenella, showing the green colouration, glandular-pubescent indumentum and the presence of dorsal keels in the sepals D-H flowers D front view of a flower of T. atlantica, showing the plicate petals E front view of a flower of T. fluminensis, showing the plicate petals F side view of two flowers of T. fluminensis, showing the plicate petals and the deflexed flowers at post-anthesis G front view of a flower of T. tenella, showing the flat petals H front view of a flower of T. umbraculifera, showing the flat and elliptic petals. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure6" httpUri="https://binary.pensoft.net/fig/211899" pageId="8" pageNumber="9">6D-F</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection lastPageId="9" lastPageNumber="10" pageId="8" pageNumber="9" type="androecium">
<paragraph pageId="8" pageNumber="9">Androecium.</paragraph>
<paragraph lastPageId="9" lastPageNumber="10" pageId="8" pageNumber="9">
As shown by
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini (2017)</bibRefCitation>
, all species of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="8" pageNumber="9" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
possess filaments densely bearded at the base with moniliform hairs, these hairs being as long as the stamens or at least the filaments; anthers basifixed, with expanded, rhomboid and yellow connectives, divergent and elliptic anther sacs and yellow pollen
<pageBreakToken pageId="9" pageNumber="10" start="start">grains</pageBreakToken>
<emphasis italics="true" pageId="9" pageNumber="10">in vivo</emphasis>
(Fig.
<figureCitation captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Floral morphology in Tradescantia subg. Austrotradescantia. A-C floral buds A floral bud of T. cerinthoides, showing the vinaceous coloration, densely hispid indumentum and absence of dorsal keels in the sepals B floral bud of T. fluminensis, showing the medium green colouration and pilose eglandular hairs restricted to dorsal keels C floral bud of T. tenella, showing the green colouration, glandular-pubescent indumentum and the presence of dorsal keels in the sepals D-H flowers D front view of a flower of T. atlantica, showing the plicate petals E front view of a flower of T. fluminensis, showing the plicate petals F side view of two flowers of T. fluminensis, showing the plicate petals and the deflexed flowers at post-anthesis G front view of a flower of T. tenella, showing the flat petals H front view of a flower of T. umbraculifera, showing the flat and elliptic petals. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure6" httpUri="https://binary.pensoft.net/fig/211899" pageId="9" pageNumber="10">6F</figureCitation>
). This pattern is exclusive to
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="9" pageNumber="10" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
(
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
), but of almost no relevance in differentiating the species within the subgenus.
</paragraph>
<caption ID-Zenodo-Dep="1305565" doi="10.3897/phytokeys.101.25057.figure6" httpUri="https://binary.pensoft.net/fig/211899" pageId="9" pageNumber="10" start="Figure 6" startId="F6">
<paragraph pageId="9" pageNumber="10">
<emphasis bold="true" pageId="9" pageNumber="10">Figure 6.</emphasis>
Floral morphology in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="9" pageNumber="10" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
.
<emphasis bold="true" pageId="9" pageNumber="10">A-C</emphasis>
floral buds
<emphasis bold="true" pageId="9" pageNumber="10">A</emphasis>
floral bud of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="9" pageNumber="10" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="9" pageNumber="10">T. cerinthoides</emphasis>
</taxonomicName>
, showing the vinaceous coloration, densely hispid indumentum and absence of dorsal keels in the sepals
<emphasis bold="true" pageId="9" pageNumber="10">B</emphasis>
floral bud of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="9" pageNumber="10" rank="species" species="fluminensis">
<emphasis italics="true" pageId="9" pageNumber="10">T. fluminensis</emphasis>
</taxonomicName>
, showing the medium green colouration and pilose eglandular hairs restricted to dorsal keels
<emphasis bold="true" pageId="9" pageNumber="10">C</emphasis>
floral bud of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="9" pageNumber="10" rank="species" species="tenella">
<emphasis italics="true" pageId="9" pageNumber="10">T. tenella</emphasis>
</taxonomicName>
, showing the green colouration, glandular-pubescent indumentum and the presence of dorsal keels in the sepals
<emphasis bold="true" pageId="9" pageNumber="10">D-H</emphasis>
flowers
<emphasis bold="true" pageId="9" pageNumber="10">D</emphasis>
front view of a flower of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. atlantica" order="Liliales" pageId="9" pageNumber="10" rank="species" species="atlantica">
<emphasis italics="true" pageId="9" pageNumber="10">T. atlantica</emphasis>
</taxonomicName>
, showing the plicate petals
<emphasis bold="true" pageId="9" pageNumber="10">E</emphasis>
front view of a flower of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="9" pageNumber="10" rank="species" species="fluminensis">
<emphasis italics="true" pageId="9" pageNumber="10">T. fluminensis</emphasis>
</taxonomicName>
, showing the plicate petals
<emphasis bold="true" pageId="9" pageNumber="10">F</emphasis>
side view of two flowers of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="9" pageNumber="10" rank="species" species="fluminensis">
<emphasis italics="true" pageId="9" pageNumber="10">T. fluminensis</emphasis>
</taxonomicName>
, showing the plicate petals and the deflexed flowers at post-anthesis
<emphasis bold="true" pageId="9" pageNumber="10">G</emphasis>
front view of a flower of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="9" pageNumber="10" rank="species" species="tenella">
<emphasis italics="true" pageId="9" pageNumber="10">T. tenella</emphasis>
</taxonomicName>
, showing the flat petals
<emphasis bold="true" pageId="9" pageNumber="10">H</emphasis>
front view of a flower of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. umbraculifera" order="Liliales" pageId="9" pageNumber="10" rank="species" species="umbraculifera">
<emphasis italics="true" pageId="9" pageNumber="10">T. umbraculifera</emphasis>
</taxonomicName>
, showing the flat and elliptic petals. Photos by M.O.O. Pellegrini.
</paragraph>
</caption>
</subSubSection>
<subSubSection lastPageId="10" lastPageNumber="11" pageId="9" pageNumber="10" type="gynoecium">
<paragraph pageId="9" pageNumber="10">Gynoecium.</paragraph>
<paragraph lastPageId="10" lastPageNumber="11" pageId="9" pageNumber="10">
The gynoecium in
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. (Austrotradescantia) subsp. subg." order="Liliales" pageId="9" pageNumber="10" rank="subGenus" subGenus="Austrotradescantia">T. subg. Austrotradescantia</taxonomicName>
presents a highly conservative morphology, being always white and glabrous, the ovary ranging from subglobose to
<pageBreakToken pageId="10" pageNumber="11" start="start">globose</pageBreakToken>
, the locules 2-ovulate, ovules anatropous with axial placentation, the style being always straight at anthesis and post-anthesis, obconical at base, conical at the apex and culminating in a reduced and punctate stigma (
<bibRefCitation DOI="https://doi.org/10.3897/phytokeys.89.20388" author="Pellegrini, MOO" journalOrPublisher="PhytoKeys" pageId="59" pageNumber="60" pagination="11 - 72" refId="B37" refString="Pellegrini, MOO, 2017. Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae. PhytoKeys 89: 11 - 72, DOI: https://doi.org/10.3897/phytokeys.89.20388" title="Morphological phylogeny of Tradescantia L. (Commelinaceae) sheds light on a new infrageneric classification for the genus and novelties on the systematics of subtribe Tradescantiinae." url="https://doi.org/10.3897/phytokeys.89.20388" volume="89" year="2017">Pellegrini 2017</bibRefCitation>
). Finally, the pistil, as a whole, can either be much longer than or approximately the same length as the stamens.
</paragraph>
</subSubSection>
<subSubSection pageId="10" pageNumber="11" type="capsules and seeds">
<paragraph pageId="10" pageNumber="11">Capsules and seeds.</paragraph>
<paragraph pageId="10" pageNumber="11">
Fruit morphology is extremely conservative in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia" order="Commelinales" pageId="10" pageNumber="11" phylum="Tracheophyta" rank="genus">
<emphasis italics="true" pageId="10" pageNumber="11">Tradescantia</emphasis>
</taxonomicName>
, being characterised by light to medium brown, thin-walled, loculicidal capsules, subglobose to globose in shape, externally glabrous and smooth and sometimes apiculate due to the persistent base of the style. The capsules are always 3-valved (Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7A</figureCitation>
), with the only known exception in the genus being
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. orchidophylla" order="Liliales" pageId="10" pageNumber="11" rank="species" species="orchidophylla">
<emphasis italics="true" pageId="10" pageNumber="11">T. orchidophylla</emphasis>
</taxonomicName>
Rose &amp; Hemsl., which seems to exclusively present a 2-locular gynoecium and, consequently, producing 2-valved capsules. Each locule can produce up to two seeds, which will directly influence their shape. The seeds range from ellipsoid to narrowly trigonal, commonly with a more truncate side if two seeds are produced in the same locule, ventrally flattened, cleft or not towards the embryotega (with cleft seeds being synapomorphic to the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="10" pageNumber="11" rank="species" species="crassula">
<emphasis italics="true" pageId="10" pageNumber="11">T. crassula</emphasis>
</taxonomicName>
group; Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7B</figureCitation>
) and the testa can be either costate (Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7B, C</figureCitation>
) or rugose, with ridges or pits radiating from the embryotega (i.e. rugose testa being exclusive to the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="10" pageNumber="11" rank="species" species="tenella">
<emphasis italics="true" pageId="10" pageNumber="11">T. tenella</emphasis>
</taxonomicName>
species complex; Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7D</figureCitation>
). The embryotega is dorsal and relatively inconspicuous, without a prominent apicule, being generally covered by a cream farinae (Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7B-D</figureCitation>
). The hilum is linear, located on a mild ridge and can vary in length depending on the species group: (1) longer than
<normalizedToken originalValue="½">1/2</normalizedToken>
the length the seed in the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="10" pageNumber="11" rank="species" species="crassula">
<emphasis italics="true" pageId="10" pageNumber="11">T. crassula</emphasis>
</taxonomicName>
group (Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7B</figureCitation>
); (2) ca. equal to
<normalizedToken originalValue="½">1/2</normalizedToken>
the length of the seed in most species of the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. fluminensis" order="Liliales" pageId="10" pageNumber="11" rank="species" species="fluminensis">
<emphasis italics="true" pageId="10" pageNumber="11">T. fluminensis</emphasis>
</taxonomicName>
group (Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7C</figureCitation>
); and (3) shorter than
<normalizedToken originalValue="½">1/2</normalizedToken>
the length of the seed in the
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. tenella" order="Liliales" pageId="10" pageNumber="11" rank="species" species="tenella">
<emphasis italics="true" pageId="10" pageNumber="11">T. tenella</emphasis>
</taxonomicName>
species complex (Fig.
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Fruit and seed morphology in Tradescantia subg. Austrotradescantia. A mature and dehisced capsule of T. cerinthoides B dorsal and ventral views of the seed of T. crassula, showing the costate testa cleft towards the embryotega and the hilum longer than 1 / 2 the length of the seed C dorsal and ventral views of the seed of T. hertweckii, showing the costate testa not cleft towards the embryotega and the hilum equal to 1 / 2 the length of the seed D dorsal and ventral views of the seed of T. atlantica, showing the rugose testa not cleft towards the embryotega and hilum shorter than 1 / 2 the length of the seed. Photos by M. O. O. Pellegrini." figureDoi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11">7D</figureCitation>
).
</paragraph>
<caption ID-Zenodo-Dep="1305567" doi="10.3897/phytokeys.101.25057.figure7" httpUri="https://binary.pensoft.net/fig/211900" pageId="10" pageNumber="11" start="Figure 7" startId="F7">
<paragraph pageId="10" pageNumber="11">
<emphasis bold="true" pageId="10" pageNumber="11">Figure 7.</emphasis>
Fruit and seed morphology in
<taxonomicName class="Liliopsida" family="Commelinaceae" genus="Tradescantia" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Tradescantia (Austrotradescantia) subsp. subg." order="Commelinales" pageId="10" pageNumber="11" phylum="Tracheophyta" rank="subGenus" subGenus="Austrotradescantia">Tradescantia subg. Austrotradescantia</taxonomicName>
.
<emphasis bold="true" pageId="10" pageNumber="11">A</emphasis>
mature and dehisced capsule of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. cerinthoides" order="Liliales" pageId="10" pageNumber="11" rank="species" species="cerinthoides">
<emphasis italics="true" pageId="10" pageNumber="11">T. cerinthoides</emphasis>
</taxonomicName>
<emphasis bold="true" pageId="10" pageNumber="11">B</emphasis>
dorsal and ventral views of the seed of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. crassula" order="Liliales" pageId="10" pageNumber="11" rank="species" species="crassula">
<emphasis italics="true" pageId="10" pageNumber="11">T. crassula</emphasis>
</taxonomicName>
, showing the costate testa cleft towards the embryotega and the hilum longer than
<normalizedToken originalValue="½">1/2</normalizedToken>
the length of the seed
<emphasis bold="true" pageId="10" pageNumber="11">C</emphasis>
dorsal and ventral views of the seed of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. hertweckii" order="Liliales" pageId="10" pageNumber="11" rank="species" species="hertweckii">
<emphasis italics="true" pageId="10" pageNumber="11">T. hertweckii</emphasis>
</taxonomicName>
, showing the costate testa not cleft towards the embryotega and the hilum equal to
<normalizedToken originalValue="½">1/2</normalizedToken>
the length of the seed
<emphasis bold="true" pageId="10" pageNumber="11">D</emphasis>
dorsal and ventral views of the seed of
<taxonomicName family="Commelinaceae" kingdom="Plantae" lsidName="T. atlantica" order="Liliales" pageId="10" pageNumber="11" rank="species" species="atlantica">
<emphasis italics="true" pageId="10" pageNumber="11">T. atlantica</emphasis>
</taxonomicName>
, showing the rugose testa not cleft towards the embryotega and hilum shorter than
<normalizedToken originalValue="½">1/2</normalizedToken>
the length of the seed. Photos by M.O.O. Pellegrini.
</paragraph>
</caption>
</subSubSection>
</treatment>
</document>
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