Lotus corniculatus Linn., Sp. Pl. 775. 1753.
Extremely variable perennial herb., prostrate, ascending or decumbent; branches glabrous, subglabrous to densely pilose. Leaf rachis up to 6 mm long, leaflets 3-20 mm long, 2-10 mm broad, broadly cuneate-obovate to narrowly obovate or linear-lanceolate, obtuse and apiculate to acuminate. Inflorescence a 3-6-flowered axillary, pedunculate umbel; peduncle 3-12 cm long. Bracts sessile, leaf-like. Calyx c. 6 mm long, teeth unequal, glabrous or pubescent. Corolla yellow, vexillum (7)-10-16 mm long. Fruit 12-30 mm long, 2-3 mm broad, cylindrical, straight, glabrous.