Trees to 20 m tall, andromonoecious. Bark gray or yellowish gray; lenticels yellow, small; buds very few, brownish, ovoid, scales glabrescent. Leaves deciduous; petiole 3-9 cm, slender; leaf blade abaxially pale green, adaxially dark green, suborbicular, 7-10 × 5-11 cm, papery, abaxially pubigerous, fulvous or brown pubescent especially on veins, adaxially glabrous or pubigerous, primary veins 5-7, prominent, reticulate veins conspicuous abaxially, base rounded or subcordate, usually 3- or 5-lobed, rarely undivided or with 1 or 2 small additional basal lobes; lobes broadly triangular-ovate, 2-3 × 1-3 cm, apex aristate or long acuminate. Inflorescence corymbose, 8-10 cm, glabrous. Peduncles 0.5-2 cm. Sepals 5, ca. 3 mm. Petals 5, obovate. Stamens 8. Fruit purplish yellow when mature; nutlets compressed, 1.3-1.5 cm × 8-10 mm; samara wing 2.5-3.8 × ca. 1.5 cm, slender, broadest at middle, apex obtuse, wings spreading nearly horizontally. Fl. Apr, fr. Aug.

● Forests; 1800-3200 m. Sichuan, SE Xizang.