97. Dysolobium (Bentham) Prain, J. Asiat. Soc. Bengal, Pt. 2., Nat. Hist. 66: 425. 1897.
镰瓣豆属 lian ban dou shu
Authors: Ren Sa & Michael G. Gilbert
Phaseolus sect. Dysolobium Bentham in Miquel, Pl. Jungh. 239. 1852.
Herbs or woody vines, twining. Leaves pinnately 3-foliolate, stipulate. Inflorescence axillary, racemose; nodes swollen. Calyx campanulate, 4-lobed; lowest lobe lanceolate, longer than others, shorter than tube, upper 2 connate. Corolla usually purple with reddish or blue striations; standard usually large, circular, base clawed; wings almost equal to applanate part of keels, obovate or elliptic, upper auricle longer, lower short, stipe slender; keels sometimes obviously curved upward, beaked. Stamens diadelphous; vexillary stamen free. Ovary sessile, with silky hairs; stigma slender, curved upward, with perichaetial cirrus at base. Legume slender, dehiscent along sutures, woody, slightly compressed, tomentose, obliquely septate between seeds. Seeds pitch-black or black, oblong or orbicular, glabrous or shortly villous; hilum oblong; aril with 2 unequal valvules.
About four species: India and SE Asia; two species in China.