Erect shrub, 1.3-4 m tall, non-sprouting. Branchlets densely tomentose and appressed-pubescent at flowering. Leaves terete, with 5 deep narrow grooves running entire length, 7-22 cm long, 1.2-1.5 mm diam., glabrous to sparsely sericeous on faces, moderately sericeous in grooves; longitudinal veins 5 (= the broad faces separated by grooves). Inflorescence a solitary axillary umbelliform raceme, grouped to form elongate brushes, with 60-80 flowers per axil; pedicels glabrous. Perianth usually pink, sometimes white ageing deep pink. Pistil 10-12.5 mm long; gland subglobular. Fruit 1-6 per axil, stalked, obliquely elliptic-acuminate, sometimes curved, 1.6-2.2 cm long, 0.8-1.1 cm wide, scarcely beaked but often abruptly narrowed into a short apiculum. Seed obliquely ovate-elliptic, acute, 11-14 mm long, 5-6 mm wide; wing extending fully down both sides of body, more broadly down one side than other, usually notched near base adaxially, sepia to dark brown with blackish brown patches towards base.
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