Perennial herb, with annual shoots from woody rootstock, up to 200 mm high; erect. Leaves trifoliolate; turning black when dried. Flowers: flowering branches < 200 mm long; bracts linear to narrowly lanceolate, < 1 mm wide; paired bracteoles 0; standard ± glabrous, > 3 mm wide; corolla yellow; Jul.-Mar. Pods glabrous, except for long hairs along sutures and apex.