Tree to 30 m high. Trichomes simple and sometimes irregularly fasciculate. Leaves opposite or subopposite, impari-or paripinnate, 4–9-foliolate, 7–18 cm long, neither petiole nor rachis winged; petiolules of lateral leaflets 2–6 mm long; terminal leaflet with petiolule 7–16 mm long; laminae elliptic or narrowly so or elliptic-obovate, ±equilateral, 4–8 cm long, 1.5–3.7 cm wide, rounded or acute. Inflorescences 12–17 cm long. Flowers apparently exclusively bisexual. Sepals 1–1.5 mm long. Petals 3.5–4 mm long, white or cream, appressed-pubescent abaxially, tomentulose adaxially. Ovules 1 on each side of placental arms. Capsule 7–11 cm long, separating (or easily separable) into 5 distinct valves at maturity; exocarp muricate, puberulous, with excrescences to 4.5 mm long. Seeds 1 on each side of much-enlarged placental arms, 5.5–7 cm long, winged at both ends. Embryo with terminal hypocotyl.
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