Slender annual herb; stems 20–30 cm long, with appressed, curled white hairs in young parts. Leaves with 3 pairs of leaflets, the lowest pair inserted well above stem; leaflets obovate, oblique, ciliate, shortly acuminate, glabrous adaxially, sparingly hirsute abaxially; upper pair 4–10 mm long, to 3.5 mm wide, lower pairs smaller. Flowering pedicel 18–23 mm long, upright. Sepals 3–3.5 mm long, glabrous adaxially, sparsely hirsute abaxially. Petals obovate, 5.5–7 mm long, yellow throughout. Extrastaminal glands 5; intrastaminal glands ?narrow sinuate ring. Stamens 10, all fertile or 5 staminodal, at maturity equal to stigma; filaments c. 2 mm long. Ovary seated on intrastaminal ring, glabrous; style (including stigma) c. 1 mm long. Fruit glabrous or rarely with a dense short erect pubescence, of 4 or 5 tardily dissociating, fully developed cocci; pedicel 18–23 mm long, deflexed. Cocci 3–3.5 mm high, rounded dorsally, smooth, lacking spines but sometimes with semicircular wing.
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