Undershrub, c. 60-120 cm tall, branches glabrous or appressed-pubescent. Leaf simple, c. 3.7-9.0 cm long, c. 10-22 mm broad, oblanceolate-oblong, obtuse, retuse or mucronate, glabrous above, silky pubescent below; petiole very short; stipules subulate. Inflorescence an erect, terminal raceme, c. 15-30 cm long. Pedicel c. 4-8 mm long. Bract 2-6 mm long; bracteoles 2, c. 1-2 mm long, half way up the pedicel. Calyx c. 10-14 mm long, glabrous to subglabrous, upper teeth ovate, acute, 3 lower narrower. Corolla c. 2.5-2.6 cm long, yellow with purple tinge. Fruit glabrous, c. 2.5-4.8 cm long, linear-oblong, 15-20-seeded; stipitate.