狭刀豆 xia dao dou

Dolichos lineatus Thunberg ex Murray, Syst. Veg., ed. 14, 658. 1784.

Herbs, perennial, twining. Leaflets ovate or obovate, 6-14 × 4-10 cm, sparsely pubescent on both surfaces, base truncate or cuneate, apex rounded or cuspidate. Racemes axillary. Calyx ca. 12 mm, pubescent, upper lip broadly 2-lobed and lobes api­culate at apex, lower lip 3-lobed, small, subtruncate. Corolla purplish red; standard broadly ovate, ca. 2.5 cm, emarginate, base with 2 thickenings, auriculate; wings linear-oblong, slightly falcate; keel obovate-oblong. Legumes oblong, compressed, 6-10 × 2.5-3 cm, each valve with extra rib ca. 3 mm from sutural rib. Seeds brown, 2 or 3, ovate, ca. 1.7 × 0.7 cm, blotched. Fl. and fr. Jun-Oct.

Sandy beaches. Fujian, Guangdong, Guangxi, Taiwan, Zhejiang [Cambodia, Indonesia, Japan, Korea, Philippines, Vietnam].