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FOC | Family List | FOC Vol. 10 | Fabaceae | Desmodium

8. Desmodium dichotomum (Willdenow) Candolle, Prodr. 2: 336. 1825.

二歧山蚂蝗 er qi shan ma huang

Hedysarum dichotomum Willdenow, Sp. Pl. 3: 1180. 1802; Desmodium diffusum (Willdenow) Candolle (Nov 1825), not Candolle (Jan 1825); H. diffusum Willdenow (1801), not (Can­dolle) Roxburgh (1832).

Subshrubs or diffuse herbs, 20-80 cm tall. Stems ad­pressed long straight hairy and spreading hooked hairy. Leaves 3-foliolate, sometimes 1-foliolate near base of stem; petiole 1.5-3.5 cm, hairy; leaflet blade elliptic or ovate to broadly ellip­tic or broadly ovate, 1.5-7 × 1-6 cm, abaxially densely ad­pressed hairy, adaxially with sparse adpressed hairs, intermixed with sparse hooked hairs. Racemes terminal or axillary or usu­ally panicles, 5-45 cm, hooked hairy, laxly flowered, 2- or 3-flowered at each node. Pedicel 2-5 mm. Calyx 4-lobed, ca. as long as tube; upper lobes 2-toothed. Corolla purple to violet, ca. 3 mm; standard obovate or broadly obovate, base shortly clawed; wings and keel wholly shortly clawed at base. Ovary densely pubescent, 5- or 6-ovuled. Legume narrowly oblong, 1-1.8 cm × 2.5-3 mm, densely hooked hairy, 5- or 6-jointed, both sutures shallowly constricted between articles. Fl. Jun-Aug, fr. Sep-Oct. 2n = 22.

Forests, thickets. S Yunnan [India, Indonesia, Malaysia, Myan­mar].


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