Single-stemmed, usually very densely branched flat-topped shrub, 0.3-2 m tall, non-sprouting. Leaves in lower parts alternate, flat and linear, usually whorled in flowering parts, concave, narrowly obovate, extremely rigid, 2.8-12 cm long, 2.5-10 mm wide, entire, acuminate, mid-green; longitudinal veins prominent at least on underside, 1 above (sometimes obscure), 1-3 below; pinnate veins visible but obscure. Inflorescence with 12-18 flowers; pedicels 3.5-5 mm long, glabrous. Perianth pale yellowish green, split to base abaxially only. Pistil 30-35 mm long; gland obovoid. Fruit 1-3 per axil, obliquely broadly ovate in lateral view, 2-2.7 cm long, 1.3-1.8 cm wide, shortly apiculate, not or shortly beaked, not corky. Seed obliquely ovate, 12-17 mm long, 6.5-11 mm wide; wing extending down both sides of body, blackish brown, sometimes with paler streaks.
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