Monographs Details: Eriosema
Authority: Grear, John W. 1970. A revision of the American species of Eriosema (Leguminosae-Lotoldeae). Mem. New York Bot. Gard. 20: 1-98.
Family:Fabaceae
Scientific Name:Eriosema
Description:Species Description - Perennial herbs or subshrubs, erect or ascending, procumbent or prostrate. Roots usually napiform or fusiform. Stems angular and striate, simple or diffusebranched. Stipules usually lanceolate, chartaceous, striate, free or connate. Leaves short-petiolate or subsessile, unifoliolate or pinnately trifoholate, the leaflets very diverse in size and form, yellow resin-dotted on both surfaces or sometimes only below. Inflorescences racemose, solitary, axillary, lax or congested. Bracts small, ciliate, striate, persistent or caducous; bractlets wanting. Corolla papilionaceous, usually yellow but often violate-striate or flushed reddish-purple, especially in age; standard usually obovate with two inflexed auricles at the base and the claw cupulate; wings narrowly oblong, uniauriculate, the claw attenuate; keel blades falcate and broader, slightly incurved at apex, laterally saccate, claw attenuate. Calyx campanulate, 5-lobed. Stamens ten, diadelphous, the vexillar stamen free; anthers uniform. Ovary sessile to subsessile, densely villous, biovulate; style filiform and glabrous, the stigma subcapitate. Fruit 2-valved, broadly oblong to somewhat rhombic and obliquely beaked. Seeds two, reniform to oblong or oval, brown to black or mottled, lustrous with a whitish strophiole; hilum long, linear.

Discussion:

Rhynchosia sect. Eriosema D C , Prodr. 2: 388. 1825.

Euriosma Desv., Ann. Sci. Nat. I 9(1): 421. 1826, nomen reiiciendus propositus.

Pyrrhotrichia Wight & Arn., Prodr. Fl. Ind. Or. 1: 238. 1834.

Euryosma Walp., Rep. 1: 785. 1842.

Muxiria Welw., Apont. 573. 1859, nomen nudum.

Type. Eriosema rufum (H.B.K.) G. Don, Gen. Hist. 2. 347. 1832.