Dioecious tree to 6 (–8) m high; irritant hairs mainly on inflorescence and abaxial leaf midrib. Leaves: lamina elliptic, entire, acuminate apex, narrowly cuneate at base, 11–20 (–31) cm long, (2–) 4–7 cm wide, glabrous except abaxial midrib usually with stinging hairs; lateral veins 13–17 pairs, short, closely set; petiole 2–4 cm long; stipules (0.5–) 1–1.5 cm long. Inflorescence ramiflorous, unisexual, branched racemes, paired; peduncle pubescent with short irritant hairs; pedicels 1–1.5 mm long. Tepals 4, with irritant hairs. Male flowers: tepals keeled; pistillode small. Female flowers: ovary c. 1.5 mm long, c. 0.8 mm wide; stigma to 3 mm long. Achenes ellipsoidal to obovoid, c. 3 mm long, 2–3 mm wide, often warty; perianth persisting as small cupule at base.
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