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<document ID-DOI="10.5252/a2011n1a7" ID-ISSN="1639-4798" ID-Zenodo-Dep="5197059" approvalRequired="22" approvalRequired_for_textStreams="22" checkinTime="1628880641368" checkinUser="carolina" docAuthor="Koopman, Margaret M." docDate="2011" docId="03A08792A117FFD0FC9BFBDEFBBFFA18" docLanguage="en" docName="Adansonia.33.1.101-113.pdf" docOrigin="Adansonia (3) 33 (1)" docSource="http://dx.doi.org/10.5252/a2011n1a7" docStyle="DocumentStyle:B98EC8A323C0F63E1C55336AD58D9273.1:Adansonia.2011-2014.journal_article" docStyleId="B98EC8A323C0F63E1C55336AD58D9273" docStyleName="Adansonia.2011-2014.journal_article" docStyleVersion="1" docTitle="Megistostegium Hochr." docType="treatment" docVersion="2" lastPageId="7" lastPageNumber="108" masterDocId="FF99FFEAA112FFD7FF8AFFF1FFD1FFD0" masterDocTitle="A synopsis of the Malagasy endemic genus Megistostegium Hochr. (Hibisceae, Malvaceae)" masterLastPageNumber="113" masterPageNumber="101" pageId="5" pageNumber="106" updateTime="1628881358302" updateUser="ExternalLinkService" zenodo-license-document="CC-BY-4.0" zenodo-license-figures="CC-BY-4.0">
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<mods:titleInfo>
<mods:title>A synopsis of the Malagasy endemic genus Megistostegium Hochr. (Hibisceae, Malvaceae)</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Koopman, Margaret M.</mods:namePart>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:titleInfo>
<mods:title>Adansonia</mods:title>
</mods:titleInfo>
<mods:part>
<mods:date>2011</mods:date>
<mods:detail type="series">
<mods:title>3</mods:title>
</mods:detail>
<mods:detail type="pubDate">
<mods:number>2011-06-30</mods:number>
</mods:detail>
<mods:detail type="volume">
<mods:number>33</mods:number>
</mods:detail>
<mods:detail type="issue">
<mods:number>1</mods:number>
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<mods:start>101</mods:start>
<mods:end>113</mods:end>
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<mods:url>http://dx.doi.org/10.5252/a2011n1a7</mods:url>
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<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">10.5252/a2011n1a7</mods:identifier>
<mods:identifier type="ISSN">1639-4798</mods:identifier>
<mods:identifier type="Zenodo-Dep">5197059</mods:identifier>
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<treatment LSID="urn:lsid:plazi:treatment:03A08792A117FFD0FC9BFBDEFBBFFA18" httpUri="http://treatment.plazi.org/id/03A08792A117FFD0FC9BFBDEFBBFFA18" lastPageId="7" lastPageNumber="108" pageId="5" pageNumber="106">
<subSubSection pageId="5" pageNumber="106" type="nomenclature">
<paragraph blockId="5.[785,1102,1071,1098]" box="[785,1102,1071,1098]" pageId="5" pageNumber="106">
<heading box="[785,1102,1071,1098]" centered="true" fontSize="11" level="2" pageId="5" pageNumber="106" reason="7">
Genus
<taxonomicName authority="Hochr." box="[862,1102,1071,1098]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="5" pageNumber="106" phylum="Tracheophyta" rank="genus">
<emphasis box="[862,1019,1072,1097]" italics="true" pageId="5" pageNumber="106">Megistostegium</emphasis>
Hochr.
</taxonomicName>
</heading>
</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" box="[699,1210,1151,1175]" pageId="5" pageNumber="106">
<emphasis box="[699,1210,1151,1175]" italics="true" pageId="5" pageNumber="106">Annuaire du Conservatoire et du Jardin botanique de</emphasis>
</paragraph>
</subSubSection>
<subSubSection pageId="5" pageNumber="106" type="description">
<paragraph blockId="5.[674,1211,1151,1699]" box="[678,1211,1178,1202]" pageId="5" pageNumber="106">
<emphasis box="[678,744,1178,1201]" italics="true" pageId="5" pageNumber="106">Genève</emphasis>
<materialsCitation box="[747,1207,1178,1202]" country="Madagascar" location="Tulear" pageId="5" pageNumber="106" specimenCount="1" typeStatus="holotype">
18-19: 221 (1915). —
<typeStatus box="[964,1015,1178,1202]" pageId="5" pageNumber="106">Type</typeStatus>
:
<collectingCountry box="[1022,1138,1178,1202]" name="Madagascar" pageId="5" pageNumber="106">Madagascar</collectingCountry>
.
<location LSID="urn:lsid:plazi:treatment:03A08792A117FFD0FC9BFBDEFBBFFA18:8ED6605FA117FFD2FBF2FB6BFB66FB62" box="[1144,1207,1178,1202]" country="Madagascar" name="Tulear" pageId="5" pageNumber="106">Tulear</location>
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.
</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" box="[674,1096,1204,1228]" pageId="5" pageNumber="106">
Massif de la Table.
<emphasis box="[863,989,1204,1228]" italics="true" pageId="5" pageNumber="106">F. Geay 5295</emphasis>
, 5301 (P).
</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" box="[677,777,1252,1276]" pageId="5" pageNumber="106">Synonym:</paragraph>
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<subSubSection lastPageId="6" lastPageNumber="107" pageId="5" pageNumber="106" type="reference_group">
<paragraph blockId="5.[674,1211,1151,1699]" pageId="5" pageNumber="106">
<treatmentCitationGroup pageId="5" pageNumber="106">
<taxonomicName authority="Costantin &amp; Poisson, Comptes Rendus des Seances de l'Academie" class="Magnoliopsida" family="Malvaceae" genus="Macrocalyx" higherTaxonomySource="GBIF" kingdom="Plantae" order="Malvales" pageId="5" pageNumber="106" phylum="Tracheophyta" rank="genus">
<emphasis box="[677,785,1299,1323]" italics="true" pageId="5" pageNumber="106">Macrocalyx</emphasis>
Costantin &amp; Poisson,
<emphasis italics="true" pageId="5" pageNumber="106">Comptes Rendus des Séances de lAcadémie</emphasis>
</taxonomicName>
<emphasis box="[931,1106,1326,1350]" italics="true" pageId="5" pageNumber="106">
des
<treatmentCitation author="" box="[969,1106,1326,1349]" journal="Sciences Paris" page="637" pageId="5" pageNumber="106" score="2.4246241844477927" volume="147" year="1908">
<bibCitation box="[969,1106,1326,1349]" journal="Sciences Paris" page="637" pageId="5" pageNumber="106" score="2.4246241844477927" volume="147" year="1908">Sciences Paris</bibCitation>
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</emphasis>
147: 637 (1908).
</treatmentCitationGroup>
</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" box="[677,801,1400,1424]" pageId="5" pageNumber="106">Homonyms:</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" pageId="5" pageNumber="106">
<treatmentCitation author="Lindl." page="764" pageId="5" pageNumber="106" score="0.8615712628081074" volumeTitle="The Vegetable Kingdom" year="1847">
<taxonomicName authority="Miers ex Lindl., The Vegetable" authorityName="Lindl., The Vegetable" box="[677,1104,1447,1472]" class="Magnoliopsida" family="Malvaceae" genus="Macrocalyx" higherTaxonomySource="GBIF" kingdom="Plantae" order="Malvales" pageId="5" pageNumber="106" phylum="Tracheophyta" rank="genus">
<emphasis box="[677,788,1447,1471]" italics="true" pageId="5" pageNumber="106">Macrocalyx</emphasis>
Miers ex Lindl.,
<emphasis box="[972,1104,1447,1471]" italics="true" pageId="5" pageNumber="106">The Vegetable</emphasis>
</taxonomicName>
<emphasis box="[1113,1202,1447,1471]" italics="true" pageId="5" pageNumber="106">Kingdom</emphasis>
: 764 (1847)
</treatmentCitation>
.
</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" pageId="5" pageNumber="106">
<treatmentCitationGroup pageId="5" pageNumber="106">
<taxonomicName authority="Trew" authorityName="Trew" box="[677,843,1521,1546]" class="Magnoliopsida" family="Malvaceae" genus="Macrocalyx" higherTaxonomySource="GBIF" kingdom="Plantae" order="Malvales" pageId="5" pageNumber="106" phylum="Tracheophyta" rank="genus">
<emphasis box="[677,784,1521,1545]" italics="true" pageId="5" pageNumber="106">Macrocalyx</emphasis>
Trew
</taxonomicName>
,
<emphasis italics="true" pageId="5" pageNumber="106">
Nova Acta Physico-medica Academiae Caesareae Leopoldino-Carolinae
<treatmentCitation author="Trew" journal="Naturae Curiosorum Exhibentia Ephemerides sive Observationes Historias et Experimenta" page="332" pageId="5" pageNumber="106" score="3.085298217926779" volume="2" year="1761">
<bibCitation journal="Naturae Curiosorum Exhibentia Ephemerides sive Observationes Historias et Experimenta" page="332" pageId="5" pageNumber="106" score="3.085298217926779" volume="2" year="1761">Naturae Curiosorum Exhibentia Ephemerides sive Observationes Historias et Experimenta</bibCitation>
</treatmentCitation>
</emphasis>
2: 332 (1761).
</treatmentCitationGroup>
</paragraph>
<paragraph blockId="5.[674,1211,1151,1699]" pageId="5" pageNumber="106">
<treatmentCitationGroup pageId="5" pageNumber="106">
<treatmentCitation author="Macrocalyx Tiegh." journal="Bulletin de la Societe botanique de France" page="357" pageId="5" pageNumber="106" score="165.90273174218356" volume="42" year="1895">
<taxonomicName authority="Tiegh." authorityName="Tiegh." box="[677,860,1648,1673]" class="Magnoliopsida" family="Malvaceae" genus="Macrocalyx" higherTaxonomySource="GBIF" kingdom="Plantae" order="Malvales" pageId="5" pageNumber="106" phylum="Tracheophyta" rank="genus">
<emphasis box="[677,786,1648,1672]" italics="true" pageId="5" pageNumber="106">Macrocalyx</emphasis>
Tiegh.
</taxonomicName>
,
<bibCitation journal="Bulletin de la Societe botanique de France" page="357" pageId="5" pageNumber="106" score="165.90273174218356" volume="42" year="1895">
<emphasis italics="true" pageId="5" pageNumber="106">
Bulletin de la Société botanique de
<collectingCountry box="[701,763,1676,1699]" name="France" pageId="5" pageNumber="106">France</collectingCountry>
</emphasis>
42: 357 (1895)
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</treatmentCitation>
.
</treatmentCitationGroup>
</paragraph>
<caption ID-DOI="http://doi.org/10.5281/zenodo.5197063" ID-Zenodo-Dep="5197063" httpUri="https://zenodo.org/record/5197063/files/figure.png" pageId="6" pageNumber="107" startId="6.[113,124,797,814]" targetBox="[283,1040,214,758]" targetPageId="6">
<paragraph blockId="6.[113,1209,797,837]" pageId="6" pageNumber="107">
FIG. 3.— Principal Components Analysis of vegetative and floral measures from herbarium specimens of
<taxonomicName authority="Hochr." authorityName="Hochr." class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="6" pageNumber="107" phylum="Tracheophyta" rank="species" species="microphyllum">
<emphasis box="[963,1209,797,814]" italics="true" pageId="6" pageNumber="107">Megistostegium microphyllum</emphasis>
Hochr.
</taxonomicName>
(O),
<taxonomicName authority="(Drake) Hochr." authorityName="Hochr." baseAuthorityName="Drake" box="[209,454,819,836]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="6" pageNumber="107" phylum="Tracheophyta" rank="species" species="nodulosum">
<emphasis box="[209,329,819,836]" italics="true" pageId="6" pageNumber="107">M. nodulosum</emphasis>
(Drake) Hochr.
</taxonomicName>
(*) and
<taxonomicName authority="Hochr." authorityName="Hochr." box="[521,667,819,836]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="6" pageNumber="107" phylum="Tracheophyta" rank="species" species="perrieri">
<emphasis box="[521,605,819,836]" italics="true" pageId="6" pageNumber="107">M. perrieri</emphasis>
Hochr.
</taxonomicName>
(·) from throughout their range.
</paragraph>
</caption>
<caption ID-DOI="http://doi.org/10.5281/zenodo.5197065" ID-Zenodo-Dep="5197065" httpUri="https://zenodo.org/record/5197065/files/figure.png" pageId="6" pageNumber="107" startId="6.[113,124,1471,1488]" targetBox="[283,1040,886,1430]" targetPageId="6">
<paragraph blockId="6.[113,1210,1471,1511]" pageId="6" pageNumber="107">
FIG. 4. — Principal Components Analysis of vegetative traits measured in
<taxonomicName authority="Hochr." authorityName="Hochr." box="[735,1048,1471,1488]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="6" pageNumber="107" phylum="Tracheophyta" rank="species" species="microphyllum">
<emphasis box="[735,986,1471,1488]" italics="true" pageId="6" pageNumber="107">Megistostegium microphyllum</emphasis>
Hochr.
</taxonomicName>
(O),
<taxonomicName authority="(Drake) Hochr." authorityName="Hochr." baseAuthorityName="Drake" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="6" pageNumber="107" phylum="Tracheophyta" rank="species" species="nodulosum">
<emphasis box="[1089,1210,1471,1488]" italics="true" pageId="6" pageNumber="107">M. nodulosum</emphasis>
(Drake) Hochr.
</taxonomicName>
(*) and
<taxonomicName authority="Hochr." authorityName="Hochr." box="[301,447,1493,1510]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="6" pageNumber="107" phylum="Tracheophyta" rank="species" species="perrieri">
<emphasis box="[301,385,1493,1510]" italics="true" pageId="6" pageNumber="107">M. perrieri</emphasis>
Hochr.
</taxonomicName>
(·) from transect data at CSM.
</paragraph>
</caption>
<paragraph blockId="6.[111,646,1578,1700]" box="[113,270,1578,1605]" pageId="6" pageNumber="107">MORPHOLOGY</paragraph>
</subSubSection>
<subSubSection lastPageId="7" lastPageNumber="108" pageId="6" pageNumber="107" type="description">
<paragraph blockId="6.[111,646,1578,1700]" lastBlockId="7.[674,1211,216,465]" lastPageId="7" lastPageNumber="108" pageId="6" pageNumber="107">
Prostrate or erect shrubs or trees to
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tall.Branches cylindrical with white/grey cork-like bark, a cracked appearance and knobby protrusions extending from the limbs. Roots few-branched, covered with a dark, papery bark and often run close to the soil surface. Leaves, petioles, stipules, peduncles, epicalyx, calyx and adaxial base of corolla densely,stellate-pubescent. Leaves borne on short shoots or not, clustered or prominently absent at branch tips. Stipules persistent or caducous, linear to lanceolate. Flowers large, solitary, axillary. Peduncles articulate. Epicalyx 4-lobed, lobes fused about halfway, campanulate, petaloid, accrescent in fruit. Calyx lobes 5, white to light pink, hidden by the conspicuous epicalyx. Petals 5, white, pink or red, obovate to narrowly elliptic, overlapping or not. Nectar copious, sweet, produced in a large trichome-filled cavity created by a flap of basal petal tissue to the adaxial side of corolla. Staminal column (
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) gives rise to 13-30 stamens with long delicate filaments in no discernable whorls, and crowned with 5 white apical teeth. Anthers monothecate and reniform. Pollen large (&gt; 100 µm), periporate, spherical, intectate with a microscabrate surface; apertures (140-150) are at the level of the exine, delimitation distinct, no annulus, pore membrane structureless. Grains echinate, echinae (80-110) smooth arranged uniformly. Style red,
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in length, branched with 5 capitate stigmas. Buds longer than wide; the fourfused epicalyx lobes being distinctively pleated and coming to a sharp point at the bud apex. Young buds (
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) covered with ferruginous hairs but become green in appearance as the bud grows in size and gains pigmentation in the last days of maturation before flowering. Fruits dry, globose, 5-locular, septicidal capsules subtended by a mature accrescent epicalyx which easily catches the wind and probably acts to disperse the reniform, tomentose seeds. Seeds gray (2[-3] per locule,
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long,
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wide,
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tall
<emphasis bold="true" box="[986,996,437,464]" pageId="7" pageNumber="108">)</emphasis>
.
</paragraph>
<paragraph blockId="7.[675,1212,501,1003]" pageId="7" pageNumber="108">
CONSERVATION STATUS OF
<emphasis italics="true" pageId="7" pageNumber="108">
<taxonomicName box="[965,1153,502,527]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="genus">MEGISTOSTEGIUM</taxonomicName>
<taxonomicName box="[677,834,533,558]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="genus">Megistostegium</taxonomicName>
</emphasis>
is restricted to the xeric, deciduous scrublands of southwestern
<collectingCountry box="[976,1103,564,591]" name="Madagascar" pageId="7" pageNumber="108">Madagascar</collectingCountry>
and associated coastline (
<figureCitation box="[854,919,596,623]" captionStart="FIG" captionStartId="4.[113,124,864,881]" captionText="FIG. 2. — Distribution of Megistostegium microphyllum Hochr. (O), M. nodulosum (Drake) Hochr. (*) and M. perrieri Hochr. (·) in southwestern Madagascar, based on locality information extracted from specimen labels." pageId="7" pageNumber="108">Fig. 2</figureCitation>
). These forests are home to some of the most distinctive plant communities on the island with extremely high levels of endemism at many taxonomic levels (
<bibRefCitation author="NICOLL M. E. &amp; LANGRAND O." box="[930,1199,691,718]" pageId="7" pageNumber="108" refId="ref9058" refString="NICOLL M. E. &amp; LANGRAND O. 1989. - Madagascar: revue de la conservation et des aires proteges. World Wide Fund for Nature, Gland, Switzerland, XVII + 374 pp." type="book" year="1989">Nicoll &amp; Langrand 1989</bibRefCitation>
) and remain severely and continuously threatened by anthropogenic habitat disturbance.
<taxonomicName box="[1049,1203,755,780]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="genus">
<emphasis box="[1049,1203,755,780]" italics="true" pageId="7" pageNumber="108">Megistostegium</emphasis>
</taxonomicName>
, in particular, is threatened by intense herbivory by goats and other livestock within and outside of protected areas, by invasive plants that no doubt compete and often better acquire the small amounts of available water (e.g.,
<taxonomicName authority="Mill." authorityName="Mill." box="[924,1073,913,940]" class="Magnoliopsida" family="Cactaceae" genus="Opuntia" kingdom="Plantae" order="Caryophyllales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="genus">
<emphasis box="[924,1013,913,939]" italics="true" pageId="7" pageNumber="108">Opuntia</emphasis>
Mill.
</taxonomicName>
) in these dry forests, and by the potential (if not actual) extinction of pollinators (Koopman 2008).
</paragraph>
</subSubSection>
<subSubSection pageId="7" pageNumber="108" type="key">
<paragraph blockId="7.[189,1134,1036,1481]" box="[390,933,1036,1063]" pageId="7" pageNumber="108">
KEY TO THE SPECIES OF
<taxonomicName authority="HOCHR." authorityName="HOCHR." box="[647,933,1036,1063]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="genus">
<emphasis box="[647,835,1037,1062]" italics="true" pageId="7" pageNumber="108">MEGISTOSTEGIUM</emphasis>
HOCHR.
</taxonomicName>
</paragraph>
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<paragraph blockId="7.[189,1134,1036,1481]" pageId="7" pageNumber="108">
<keyLead pageId="7" pageNumber="108">
1. Tree; leaves thin/flexible; flowers zygomorphic; staminal column curved, well exserted past corolla (
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long) ......................................................................
<taxonomicName box="[990,1134,1118,1142]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="species" species="nodulosum">
<emphasis box="[990,1134,1118,1142]" italics="true" pageId="7" pageNumber="108">M. nodulosum</emphasis>
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</paragraph>
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<keyLead pageId="7" pageNumber="108">
— Prostrate to tall shrub; leaves fleshy; leaf base rounded; flowers actinomorphic, staminal column straight, exserted equal to or barely past corolla (
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long) ....................... 2
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<paragraph blockId="7.[189,1134,1036,1481]" pageId="7" pageNumber="108">
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2. Prostrate subshrub restricted to calcareous rocky plateaus in extreme southern
<collectingCountry box="[1008,1130,1227,1251]" name="Madagascar" pageId="7" pageNumber="108">Madagascar</collectingCountry>
; stipules foliaceous, persistant; leaves large (
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×
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), clustered at branch tips; flowers large (epicalyx 3.9-5.0 cm long), often pendant; epicalyx dark maroon; corolla forming a wide cup (apical diameter more than
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) ..............................
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<emphasis box="[1025,1134,1314,1337]" italics="true" pageId="7" pageNumber="108">M. perrieri</emphasis>
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— Multi-stemmed shrub (
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tall) on sand or rocky sand throughout southwest
<collectingCountry name="Madagascar" pageId="7" pageNumber="108">Madagascar</collectingCountry>
; stipules minute, early caducous; leaves small (
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×
<quantity box="[935,1054,1370,1394]" metricMagnitude="-3" metricUnit="m" metricValue="8.5" metricValueMax="13.0" metricValueMin="4.0" pageId="7" pageNumber="108" unit="cm" value="0.85" valueMax="1.3" valueMin="0.4">0.4-1.3 cm</quantity>
), borne on short shoots, often absent from branch terminals; flowers small (epicalyx
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long), erect; epicalyx orange-red; corolla tight around staminal column (apical diameter
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) ........................................................................................
<taxonomicName box="[961,1134,1456,1480]" class="Magnoliopsida" family="Malvaceae" genus="Megistostegium" kingdom="Plantae" order="Malvales" pageId="7" pageNumber="108" phylum="Tracheophyta" rank="species" species="microphyllum">
<emphasis box="[961,1134,1456,1480]" italics="true" pageId="7" pageNumber="108">M. microphyllum</emphasis>
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