Erect or spreading annual herb, 0.2–0.5 (–0.85) m high, with taproot; young stems slightly ridged, green, strigose with sparse to moderately dense, appressed or rarely short spreading, equally biramous hairs. Leaves simple; stipules triangular, 0.3–1 mm long, pubescent, persisting; petiole 1–3 mm long; multicellular hairs absent to moderately dense in the leaf axils, inconspicuous, red, club-shaped. Lamina elliptic to narrowly ovate, (10–) 20–50 (–65) mm long, (1–) 3–8 (–12) mm wide; upper surface green with sparse, appressed hairs, rarely glabrous; lower surface green (paler than above), with sparse, appressed hairs; apex acute or obtuse and apiculate. Inflorescences 25–80 (–125) mm long, shorter to longer than leaves; peduncle (1–) 5–15 (–27) mm long; bracts triangular to ovate, 0.3–0.7 (–1.0) mm long; flowers pink to purple, pedicel 1–2 (–4.0) mm long. Calyx 2–2.8 mm long, with subequal lobes equal to or longer than the length of the tube and sparse to moderately dense, grey appressed hairs. Standard purple, ovate or obovate to orbicular, 4.5–5.7 mm high, 3.7–4.2 mm wide. Wings oblong to narrowly obovate with some hairs at base, 4.8–5.5 mm long, 1.5–1.7 mm wide. Keel 4.5–5.3 mm long, 1.7–1.8 mm deep; lateral pockets 0.6–1 mm long; apex rounded or rarely beaked; glabrous or with sparse hyaline hairs mostly along the bottom. Staminal tube 3.2–3.5 mm long, colourless. Ovary glabrous. Pods ascending to descending, terete, (10–) 20–35 mm long, 2–2.5 (–3.0) mm deep, brown, glabrous; apex shortly pointed or beaked; endocarp spotted; seeds (4–) 7–9 (–10) per fruit.
Occurs in a wide range of habitats, from ridge tops to creek lines, and on a range of substrates, although it is generally found on gravelly or sandy soil in open woodland.
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