Herbs, deciduous. Tubers compressed, 0.8-1.2(-1.5) cm in diam. Leaves usually 1(or 2); stipules caducous, ovate-lanceolate; petiole 11-19(-25) cm, subglabrous; blade sometimes purple abaxially, broadly ovate, slightly asymmetric, 12-20 × 8-18 cm, subglabrous, venation palmate, 6- or 7-veined, base oblique, shallowly cordate, margin irregularly serrulate, shallowly lobed, divided to 1/3 of leaf length; lobes 3-7(-9), apex long caudate. Inflorescences terminal, racemose at base, glabrous; peduncle 8-35(-50) cm; bracts ovate-lanceolate, ca. 5 × 2 mm, membranous, apex acuminate. Staminate flowers: pedicel 1-1.5 cm; tepals 4, pinkish, outer 2 ovate to broadly ovate, 1.1-1.2 × 1.1-1.4 cm, glabrous; inner 2 oblong-obovate, 0.8-1.2 cm × 4-7 mm; stamens 8-13; filaments fused at base, 1.7-2 mm; anthers obovoid-oblong, 1.4-2 mm, apex rounded or emarginate. Pistillate flowers: pedicel 1.8-2.2 cm; tepals 3 or 4, pinkish, outer 2 broadly oblong or suborbicular, 12-14 × 9-10 mm, inner 1 or 2 elliptic, 5-10 × 2-6 mm; ovary glabrous, 3-loculed; placentae axile, undivided; styles 3, ca. 3 mm, nearly free; stigmas U-shaped. Capsule pendulous, trigonous, clavate, 1-1.2 cm × 3-5 mm, wingless. Fl. Aug, fr. Sep.

This species is similar to Begonia labordei but differs by the undivided placentae and the wingless capsule.

● Forest understories, on rocks in shaded moist environments on slopes or along streams. Chongqing (Nanchuan), Sichuan (Emei Shan, Hongxi).