Erect broom-like shrub, 1-3 m tall, non-sprouting. Branchlets ±glabrous at flowering. Leaves ±terete, hexagonal in cross-section in proximal half, 10-sided in distal half, flat or shallowly concave between angles, 3-12 (-15) cm long, 1-1.5 mm diam., glabrous; longitudinal veins 6 all around at angles in proximal half, 10 in distil half. Inflorescence a solitary axillary moderately elongated raceme, with 36-44 flowers; pedicels glabrous. Perianth cream-white. Pistil 8-10.5 mm long; gland broadly obovoid. Fruit 1-4 on usually enlarged rachis, subsessile, obliquely ovate-elliptic, slightly curved, 0.9-1.9 cm long, 0.6-1.2 cm wide, acuminate, scarcely beaked but with prominent readily broken apiculum. Seed acutely obliquely ovate-to obovate-elliptic, 8-11 mm long, 3-4 mm wide; wing extending down both sides of body, more broadly down one side than other, usually notched near base adaxially, blackish brown with black streaks and patches.
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