Tree to 35 m high. Trichomes simple, fasciculate, and stellate. Leaves opposite, paripinnate, 4–12-foliolate, 13–34 cm long, neither petiole nor rachis winged; petiolules 4–10 mm long; laminae ovate to elliptic or narrowly so, or subfalcate, usually inequilateral, 6–13.5 cm long, 2.5–5.5 cm wide, rounded to acute or rarely subacuminate. Inflorescences 10–25 cm long. Flowers bisexual or at least a few male. Sepals 1–1.2 mm long. Petals 2–2.5 mm long, white or cream, sparsely appressed-pubescent abaxially, glabrous or with a few papillae adaxially. Ovules in bisexual flowers 2 on each side of placental arms. Capsule 3.2–5.5 cm long, with valves separating to ½ or more of their length, but not completely; exocarp muricate, puberulous, with excrescences (often becoming blunt with age) to c. 2 mm long. Seeds 2 on each side of much-enlarged placental arms, 2.7–3.3 cm long, winged at apical end only. Embryo with lateral hypocotyl.
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