Erect shrub, 1.5-3 m tall, non-sprouting. Branchlets appressed-pubescent at flowering, often patchily glabrescent. Leaves ±flexible, broadly to narrowly linear, flat, concave or trigonous, 5-24 cm long, 1-12 mm wide, ±glabrous; marginal veins prominent; midvein only or sometimes 3 longitudinal veins prominent below, not or scarcely visible above; secondary veins sometimes faintly visible below. Inflorescence a solitary axillary umbelliform raceme, with 8-24 flowers; pedicels pink, glabrous or rarely sparsely pubescent. Perianth cream-white. Pistil 3-6 mm long; gland a small flap, 0.4-0.8 mm high. Fruit shortly stalked, obliquely narrowly ovate-elliptic, straight or slightly curved towards apex, 1.3-2.6 cm long, 0.6-1.1 cm wide, scarcely beaked but narrowed into a long fragile apiculum. Seed obliquely narrowly ovate-elliptic, 10-18 mm long, 4-6.5 mm wide; wing extending narrowly down both sides of body, blackish brown.