长叶豇豆 chang ye jiang dou

Dolichos luteolus Jacquin, Hort. Bot. Vindob. 1: 39. 1770; Vigna acuminata Hayata; V. glabra Savi, nom. illeg. superfl.; V. repens (Linnaeus) Kuntze (1891), not Baker (1876); V. repens var. glabra Kuntze.

Trailing or twining herbs, 1.2-2.4 m. Stems with upper parts hairy or glabrescent. Stipules lanceolate, 3-4 × ca. 2 mm, 2-lobed at base; petiole 2-8 cm; leaflets ovate, ovate-elliptic, or ovate-lanceolate, rarely linear-lanceolate, 2.5-11 × 0.4-5 cm, sparsely pubescent on both surfaces or glabrous, base rounded or cuneate, margin entire, apex acute or acuminate. Racemes axillary; peduncles 5-40 cm; rachis 1.5-5 cm, 12-20-flowered; pedicels 4-9 mm, hirsute. Bracteoles ovate-lanceolate, 1.5-2 mm. Calyx pubescent or glabrescent; tube 3-4 mm; lobes del­toid, 2-4 mm, upper 2 wholly connate, apex acute or rarely 2-lobed. Standard yellow or greenish, sometimes tinged with red dorsally, oblate, 1.3-2.5 × 1.2-2.6 cm, glabrous, apex emargi­nate; wings obovate; keel shortly beaked. Legumes linear, 4-8 cm × 5-6.5 mm, pubescent, slightly constricted between seeds. Seeds dark brown or gray brown and with black spots, oblong or ovate-rhombic, 3-6 × 2-3.5 mm; hilum oblong.

In open ground near seasides; below 100 m. Taiwan [widely dis­tributed in tropical regions].