Slender annual herb; stems 20–60 cm long, glabrous (Lizard Island specimens) or usually with dense appressed, curled white hairs in young parts. Leaves with (2–) 3 (–4) pairs of leaflets, the lowest pair inserted well above stem; leaflets ovate or obovate, oblique, ciliate, obtuse or shortly acuminate, glabrous adaxially and abaxially; upper pair to 18 mm long, to 8 mm wide, lower pair(s) smaller. Flowering pedicel (3.5–) 10–25 mm long, upright. Sepals 2.5–4 mm long, glabrous adaxially, sparsely white-appressed-hairy or glabrous abaxially. Petals obovate, 5.5–7.5 (–8.5) mm long, yellow throughout. Extrastaminal glands 5; intrastaminal glands 5 or a sinuate ring. Stamens 10, all fertile or up to 6 staminodal, at maturity equal to stigma; filaments 1.5–3 mm long. Ovary 5-lobed, with 5 bundles of lax white hairs or glabrous; style (including stigma) 1.0–2.0 mm long. Fruit glabrous or shortly pubescent, of 4 or 5 tardily dissociating, fully developed cocci; pedicel (7–) 13–25 mm long, deflexed. Cocci 3–3.5 mm high, somewhat rounded dorsally and with pair of divergent medial and retrorse basal spines or bumps.
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