Shrubs scandent. Branchlets gray-brown, subglabrous, striate. Petiole 2.5-9 cm, subglabrous; leaf blade abaxially yellow-brown and adaxially brown when dry, broadly ovate, 11-15 × 8-11 cm, papery, abaxially pubescent along veins, especially on both sides of midvein and at vein axils, adaxially glabrous, secondary veins 7 or 8 on both sides of midvein, usually 1- or 2-branched, curved, base truncate or subcordate, margin slightly reflexed and entire or distally sparsely serrulate from middle, apex acute to acuminate. Inflorescences corymbose, densely brown pubescent when young, glabrescent on peduncle and proximal branches. Sterile flowers with expanded sepal 1, ovate-lanceolate, 2.5-6 × 1.5-4 cm. Fertile flowers with calyx tube obconical, ca. 3 mm; teeth ovate-triangular, ca. 0.5 mm. Petals oblong, 2.5-3 × 1-1.5 mm, apex acute, hood-shaped. Stamens to 5 mm, subequal; anthers oblong, ca. 0.8 mm. Style ca. 1 mm. Capsule obconical, 8-12 × 3-5 mm, base acute to narrowly cuneate, projected apical part broadly conical, 1.5-2 mm. Seeds 5-7 mm; wings 2-3 mm. Fl. Jul, fr. Oct-Nov.

* Forests in valleys; ca. 600 m. C Sichuan (Baoxing Xian, Tianquan Xian).