Oryxis

Taxonomy

Oryxis A. Delgado Salinas & G.P. Lewis Kew Bull. 52(1): 221. 1997.

Subfamily: Faboideae.
Phylogenetic Number: 3.10.69A.
Tribe: Phaseoleae.
Subtribe: Phaseolinae.
Species Studied - Species in Genus: 0 studied; 1 in genus.

Description

Fruit: A legume; unilocular; 5–7 cm long; 0.4–0.5 cm wide; 2–9 times longer than wide, or more than 9 times longer than wide; with deciduous androecial sheath; with deciduous corolla; with deciduous calyx; without orifice formed by curving of fruit or fruit segments; straight; not plicate; not twisted; symmetrical; linear to oblong; not inflated; terete; without beak; wing(s) absent (assumed); with all layers dehiscing; splitting along suture(s). Dehiscence of valves along both sutures; active; with valves twisting. Replum invisible (assumed). Epicarp pubescent and indurate; with hairs appressed; with 1 type of pubescence; short strigose (antrorse); with simple hairs; eglandular (assumed); without spines (assumed); without embedded tissue, much thicker than epicarp, running from base to apex. Seed(s) 5–6; length parallel with fruit length.

Distribution

Brazilian state of Minas Gerais.

New World; South America (Minas Gerais, Brazil).

Generic Notes

Lackey (1981) noted that "Dolichos monticola C.F.P. von Martius ex G. Bentham is better placed in" Dolichopsis (3.10.69). Lewis (1991) acted on Lackey's suggestion, and made the new combination, Dolichopsis monticola (C.F.P. von Martius ex G. Bentham) G.P. Lewis. Delgado Salinas and Lewis (1997) later erected this new monotypic genus for the species.

Tribal Notes

Tribe Phaseoleae

Bruneau et al. (1995) carried out cladistic analyses of tribe Phaseoleae using chloroplast DNA restriction site data. Their results indicated that the tribe is not monophyletic and that the tribal delimitations between Phaseoleae and Desmodieae (11) and between Phaseoleae and Millettieae (7) are problematic.