Prostrate, silvery villous herb; stems to 1 m long. Leaves in unequal pairs, occasionally alternate, with (4–) 7–9 pairs of leaflets; leaflets subsessile, elliptic, 10–17 mm long, 4–7 mm wide, rounded-oblique at base, acuminate, villous adaxially, more densely villous abaxially. Flowering pedicel 10–30 mm long, upright. Sepals 10–11 mm long, glabrous adaxially except for pubescent apex, densely villous abaxially except for glabrous hyaline margin. Petals broadly obovate, 15–30 mm long. Intrastaminal glands complete ring. Stamens 10, in 2 slightly unequal whorls; filaments 4.5–7 mm long. Ovary densely white-strigose; style 4–5 mm long; stigma much shorter than style. Fruit to 30 mm high and 50 mm wide (including spines), of 2 or 3 tardily dissociating cocci; fruiting pedicel 20–60 mm long. Cocci asymmetrical, woody, pubescent and with many slender, sometimes toothed, spines (3–) 10–17 mm long, all over dorsal surface.
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