Slender erect shrub, 3-4 m tall, non-sprouting. Branchlets densely sericeous at flowering. Leaves almost filiform, trigonous, straight or slightly curved, 20-30 (-40) cm long, 1.8-2.2 mm wide and deep, glabrescent (but minutely papillose); longitudinal veins 3 (including marginal veins), at angles of lamina. Inflorescence a solitary axillary umbelliform raceme, with 4-6 flowers; pedicels ?cream-white, glabrous. Perianth cream-white. Pistil 3.8-4 mm long; gland absent. Fruit shortly stalked, obliquely elliptic, 2.3-2.8 cm long, 1-1.6 cm wide, scarcely beaked; apiculum 2-4 mm long. Seed obliquely elliptic, c. 12 mm long, c. 5.5 mm wide; wing extending narrowly and fully down both sides of body, blackish brown.
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