Oxystelma

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Gentianales

Familia: Apocynaceae
Subfamilia: Asclepiadoideae
Tribus: Asclepiadeae
Subtribus: Asclepiadinae
Genus: Oxystelma
Species: O. bornouense – O. esculentum
Name

Oxystelma R.Br., Prodr. Fl. Nov. Holland.: 462 (1810)

Type species: O. esculentum (L.f.) Sm.

Synonymy

Homotypic
Extelma Dumort., Anal. Fam. Pl.: 26 (1829)
Aploca Necker ex Kuntze in Post & Kuntze, Lex. 39. (1903), nom. illeg. non Aploca Neck., Elem. Bot. 1: 255 (1790), opus utique oppr. vide Periploca Tourn. ex L., Sp. Pl.: 211 (1753)
Sarcostemma subg. Oxystelmum (R.Br.) R.W.Holm Ann. Missouri Bot. Gard. 37(4): 537. (1950)

References

Brown, R. 1810. Prodromus Florae Novae Hollandiae 462. 462.
Govaerts, R. et al. 2017. Oxystelma in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2017 Sept. 2. Reference page. 
International Plant Names Index. 2017. Oxystelma. Published online. Accessed: Sept. 2 2017.
Tropicos.org 2017. Oxystelma. Missouri Botanical Garden. Published online. Accessed: 2 Sept. 2017.

Oxystelma is a genus of flowering plants of the family Apocynaceae, first described as a genus in 1810.[1][2] It is native to Africa and Asia.[3]
Species

The Plant List[4] includes:

Oxystelma bornouense R.Br. - tropical Africa
Oxystelma esculentum (L.f.) Sm. - China (Guangdong, Guangxi, Yunnan), Indochina, Indian Subcontinent (India, Sri Lanka, Bangladesh, Nepal, Pakistan), Middle East, NE Africa

Species that were formerly included

The following species have been moved to other genera (Ischnostemma, Philibertia, Cynanchum, Telosma and Tylophora):

O. carnosum now Ischnostemma carnosum
O. bifidum now Tylophora bifida
O. gilliesii now Philibertia gilliesii
O. hooperianum now Cynanchum hooperianum
O. ovatum now Telosma cordata
O. pulchellum now Cynanchum pulchellum
O. solanoides now Philibertia solanoides
O. vailiae now Philibertia picta
O. violacea now Philibertia gilliesii

References

Tropicos, genus Oxystelma
Brown, Robert. 1810. Prodromus Florae Novae Hollandiae 462 in Latin
Flora of China, Vol. 16 Page 202 尖槐藤属 jian huai teng shu Oxystelma R. Brown, Prodr. 462. 1810.
The Plant List, genus Oxystelma