Erect, annual herb 12-30 cm tall, branched. Stems striate, glabrous or minutely and sparsely asperulous. Leaves 3-5-foliolate, petiolate; petioles up to 2-5 cm long; leaflets linear, 1-4-5 cm long, 0-5-1-5 mm broad, subacute, glabrous to minutely and sparsely asperulous. Inflorescence a lax terminal raceme; bracts simple, linear, 1 mm long, caducous; pedicels up to 1 cm long, equalling or longer than the gynophore, slender, glabrous to sparsely puberulous. Sepals 1 • 5-2 mm long, linear-lanceolate, acuminate, puberulous on keel and margins; receptacle widened into an adaxial, minute pouch. Petals oblong-elliptic 1-1 -5 cm long, 1-5-2-5 mm broad, rounded at the apex, tapering into a basal claw about as long as the lamina, pink to mauve, the two slightly shorter upper ones having a median yellow band margined with purple. Stamens 6-8; the 2-4 fertile ones longer; filaments slender, declinate and then curved upwards about the middle, as long as the petals and with anthers 2 mm long; the 2-4 sterile sta
