Erect or spreading shrub to 2.5 m high; stems terete, glabrous to densely appressed- or spreading-pubescent. Leaves alternate or opposite, unifoliolate; petiole distinct, to 1.5 mm long, often with slender spur to 1 mm long: lamina linear or linear-lanceolate, 10–28 mm long, 1–3 mm wide, rounded basally; apex acuminate or pungent; upper surface dark green, usually glabrous; lower surface paler, glabrous to densely pubescent; stipules setaceous, to 3 mm long, spreading to reflexed, persistent. Flowers solitary, or occasionally paired, 7–12 mm long; pedicels filiform, 6–8 mm long; bracts crowded, less than 1 mm long; bracteoles c. 1 mm long, inserted at or above middle of pedicel, persistent; calyx 3–5 mm long, ± glabrous, tube longer than lobes; upper lobes much broader than the lower; standard mainly red externally and golden-yellow internally; ovary stipitate, ± glabrous, 3–4-ovulate. Pod elliptic or obovate to oblong, 1–2 cm long; stipe about as long as or exceeding the calyx. Flowers May, Sep.–Nov.
