Perennial, much-branched, erect shrubby herb, up to 75 cm tall, with rigid, leafless-looking stems. Leaves are heteromorphic, with basal leaves caducous, narrowly elliptic to oblong-elliptic, 24 mm long and 2.5–10 mm wide, entire or with a few teeth, sparsely covered with long glandular hairs, and borne on non-twining petioles. Upper leaves are also caducous, about 10 mm long and 2.5 mm wide, but borne on short, often twining petioles. Calyx lobes are lanceolate to ovate. Corolla is yellow, up to 18 mm long, glandular-pubescent externally; spur is slender, straight, up to 13 mm long, extending along the tube and much longer than the corolla. Flowers have two pairs of unequal-length, included stamens. Fruits are capsules 3–4.5 mm long, containing tuberculate seeds.