Begonia delavayi Gagnepain; B. mairei H. Léveillé.

Herbs, deciduous. Tubers 8-10 mm in diam. Leaves 1(or 2), basal; stipules ovate-lanceolate, membranous, margin ciliate, caducous; petiole 6-13 cm, brown villous; blade triangular-ovate or broadly ovate, rarely suborbicular, 3.5-6 × 4-7.5 cm, sparsely pubescent, venation palmate, base oblique, deeply cordate, margin crenate, apex obtuse, acute, or shortly acuminate. Inflorescence terminal, 7.5-12 cm tall, pilose or subglabrous, with very few flowers; bracts oblong or elliptic, ca. 5 × 4 mm, membranous, margin serrate, apex acute. Staminate flowers: pedicel ca. 1 cm; tepals 2, pink, oblate-orbicular or broadly ovate, 8-12 × 10-13 mm, glabrous; stamens numerous; filaments free, 1.2-1.5 cm; anthers obovoid, ca. 1.2 mm, apex emarginate. Pistillate flowers: tepals 2, oblate, 6-8 × 7-8 mm; glabrous; ovary glabrous, 3-loculed; placentae axile, undivided; styles 3; stigmas 2-cleft. Capsule pendulous, oblong, ca. 11 × 5 mm, unequally 3-winged; abaxial wing triangular, 5-7 mm; lateral wings smaller. Fl. Sep-Oct, fr. Oct. 2n = 30*.

● On rocks or in fissures, shaded moist environments; 800-2600 m. N Guangxi, SE Guizhou, Hubei (Yichang), Sichuan, Yunnan.