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2. Vigna marina (Burman) Merrill, Interpr. Herb. Amboin. 285. 1917.
滨豇豆 bin jiang dou
Phaseolus marinus Burman, Index Alt. Herb. Amboin. 18. 1769.
Perennial herbs, prostrate or climbing. Stems up to several meters, glabrescent when old. Stipules 2-lobed at base, ovate, 3-5 mm; leaflets ovate-orbicular or obovate, 3.5-9.5 × 2.5-7.5 cm, very shortly setose to subglabrous on both surfaces, base broadly cuneate or narrowly rounded, apex rounded, obtuse, or emarginate. Racemes axillary, 2-4 cm; peduncles 3-13 cm. Calyx 2.5-3 mm; teeth deltoid, 1-1.5 mm, upper 2 connate. Corolla yellow; standard broadly obovate, 1.2-1.3 × ca. 1.4 cm; wings and keel ca. 1 cm. Legumes linear-oblong, 3.5-6 × 0.8-0.9 cm, pubescent when young, later glabrous, slightly constricted between seeds. Seeds 2-6, yellow-brown or red-brown, oblong, 5-7 × 4.5-5 mm; hilum oblong. Fr. Oct.
On sandy beaches. Hainan, Taiwan [widely distributed in tropical regions].
This species is edible and is used medicinally.
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