Erect perennial herb 0.15–0.45 m high, with woody rootstock or taproot; young stems ridged, green, strigose with sparse, appressed to shortly spreading, equally biramous hairs. Leaves simple; stipules narrowly triangular to linear, 1.2–4 mm long, glabrescent, ± persistent; petiole 1–2 mm long. Lamina narrowly ovate to narrowly elliptic or linear, (15–) 25–55 (–70) mm long, (0.9–) 1.5–5 (–8.0) mm wide; upper surface green, glabrous or with sparse, appressed hairs; lower surface green (paler than above), with sparse, appressed hairs; apex obtuse or acute and apiculate; veins not prominent. Inflorescences (3–) 13–30 mm long, shorter than leaves, generally with 3, very rarely 2 or 4, flowers; peduncle (1.0–) 8–20 (–28) mm long; bracts triangular, (0.4–) 0.8–1.5 mm long, sometimes persistent; flowers pink to purple, pedicel (0.7–) 1–2 mm long. Calyx 2–3 (–3.3) mm long, with subequal lobes equal to or longer than the length of the tube and sparse, white to grey, appressed hairs. Standard pink, obovate to orbicular, 4.1–5.2 mm high, 3–4 (–4.9) mm wide. Wings narrowly obovate, (4–) 5–6 mm long, 1–2 mm wide. Keel 4.7–5.7 mm long, 1.5–2 mm deep; lateral pockets 0.5–1 mm long; apex beaked; glabrous or with sparse, hyaline hairs along the bottom. Staminal tube (2.0–) 2.5–4 mm long, colourless. Ovary glabrous. Pods ascending, terete, (10–) 20–30 (–38) mm long, 2–2.5 mm deep, brown, glabrous; apex shortly beaked; endocarp spotted, sometimes faintly; seeds (2–) 7–9 per fruit.
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