Large spreading shrub or small tree. Shoots densely hairy, somewhat angular. Lvs terete, simple, 20-60 × 0.7-1 mm, glabrous except when very young, rigid and spiny. Fls few, in fascicles of < 10; peduncles 0 or very short, densely hairy. Pedicels 3-4 mm long, densely hairy to glabrate. Perianth white, glabrous, = pedicels. Ovary shortly stipitate or sessile; style glabrous; stigma cone slightly oblique. Fr. 2-3 × 1.4-2.5 cm, mostly very corrugated; beak very short. Seed 15-25 × 6-12 mm (including wing), black; wing extending down 1 side.