Perennial rounded glabrous shrub to 1 m high. Branchlets compressed, tinged red. Leaves terete, 8–62 mm long, 0.5–2 mm wide, minutely papillose, villous at base, yellow-green. Flowers in cymes; pedicels 12–15 mm long. Perianth segments equal in length, free almost to base, white inside. Stamens many, in 4 clusters alternate with perianth segments; filaments terete, papillose. Capsules with bifid valves. Seeds comma-shaped, laterally compressed, minutely and densely papillose, dark brown to black.