Synopsis of Euphorbia (Euphorbiaceae) in the state of São Paulo, Brazil
Author
Silva, Otávio Luis Marques Da
Author for correspondence. Email: otaviolmarques @ gmail. com
Author
Cordeiro, Inês
Author
Caruzo, Maria Beatriz Rossi
text
Phytotaxa
2014
2014-10-08
181
4
193
215
http://dx.doi.org/10.11646/phytotaxa.181.4.1
journal article
10.11646/phytotaxa.181.4.1
1179-3163
5146135
21.
Euphorbia setosa
(Boiss.) Müller Argoviensis (1874: 672)
(
Fig. 7A–C
).
Euphorbia selloi
var.
setosa
Boissier (1862: 50)
.
Lectotype
(designated here):
—
BRASIL
.
Goiás
: in campis incultis,
N.T. Lund
s.n.
(G00311064!); remaining
syntypes
: same locality,
L. Riedel
s.n.
(LE);
Tijuco,
F
. Sellow s.n. (not located);
Minas Gerais
: in cacumine montis
Urubu,
J.B.E
. Pohl 1674 (W0031069!).
Distribution and habitat:—
Euphorbia setosa
is endemic to
Brazil
(Distrito Federal,
Goiás
,
Minas Gerais
and
São Paulo
). In the State of
São Paulo
it occurs in cerrado vegetation.
Representative Specimen:—
BRAZIL
.
São Paulo
:
Pedregulho
,
06 November 1997
,
W. Marcondes-Ferreira
et al. 1555
(SP, SPSF)
.
Taxonomic notes:—
Euphorbia setosa
may be easily identified among the species in the state of
São Paulo
by its cyathial glands with erect and pubescent petaloid appendages, while others species’ petaloid appendages are always patent and glabrate. By having cyathia arranged in capitate dichasia and hirsute stems,
Euphorbia setosa
may be misidentified as
E. hirta
or
E. ophthalmica
, but these species may be distinguished by their lanceolate blades, cladodromous venation, entire leaf margin (
vs.
elliptic blades, actinodromous venation, serrate leaf margin in
E. hirta
and
E. ophthalmica
), number of flowers in each staminate cymule (
10–12 in
E. setosa
vs.
1–2 in
E. hirta
and
E. ophthalmica
), and alveolate seeds coat (
vs.
seeds with transverse ridges in
E. hirta
and
E. ophthalmica
).
The species is commonly misidentified as
Euphorbia selloi
(Klotzsch & Garcke in
Klotzsch 1860: 32
)
Boissier (1862: 50)
, which is in fact very similar to it. However, it can be distinguished from it by its cyathial glands with erect and pubescent petaloid appendages (
vs.
patent and glabrous in
E. selloi
). Besides this, the geographic distribution is distinct between both species:
E. setosa
occurs in central–southeastern
Brazil
and
E. selloi
occurs in southern
Brazil
, northern
Argentina
and
Uruguay
(
Simmons & Hayden 1997
).