海南镰扁豆 hai nan lian bian dou

Twining herbs. Stems angular, pubescent. Leaves pin­nately 3-foliolate; stipules ovate-lanceolate, striate; stipels line­ar, 3-5 mm; leaflets ovate-rhombic, 6-7 × 4-6 cm, appressed pubescent on both surfaces, 3-veined from base, base rounded or broadly cuneate, apex acuminate and apiculate. Racemes axillary, 7-14 cm, densely pubescent, with flowers in upper 2-3 cm; peduncles 5-11 cm. Bracts ovate, striate, caducous; bracte­oles ovate, ca. 5 mm. Calyx ca. 5 mm; teeth very short, upper 2 nearly wholly connate. Corolla white with purple striae, 16-18 mm; standard below middle with 2 appendages; wings obovate-oblong, with round auricles at top of claw; keel falcate, apex obtuse. Ovary linear, slightly pubescent; style glabrous; stigma brush-shaped. Legumes linear, ca. 6 × 0.7 cm, compressed, pu­bescent. Seeds 7. Fl. Dec.

Thickets, open forests. Hainan [Laos, Vietnam].