Begonia mengtzeana Irmsch.

Herbs, erect. Stems 1.5-2 mm in diam., brown villous. Leaves basal and cauline; stipules persistent, suborbicular or reniform, 6-7 × 8-12 mm, abaxially setose, margin irregularly ciliate, apex obtuse or rounded; petiole 0.5-4 cm, densely brown villous; blade purple, light green on veins, ovate or broadly ovate, rarely oblate-orbicular, asymmetric, 5-6 × 5-8 cm, sparsely hispidulous, venation palmate, 5- or 6-veined, base oblique, cordate, margin irregularly denticulate, distinctly divided; lobes 3-5, triangular, apex long acuminate or long caudate. Inflorescences brown villous; peduncle 2.4-3.4 cm; bracts ovate, 9-10 × 6-7 mm, margin ciliate, apex shortly acuminate. Staminate flowers: tepals 4, white, outer 2 oval, 1.8-2.2 × 1.5-1.8 cm, abaxially villous, inner 2 obovate, 1.4-1.8 × 1-1.2 cm; filaments fused at base; anthers obovoid, 1-1.2 mm. Pistillate flowers: tepals 5, white, unequal, largest oval, 1.5-1.7 × 1.2-1.3 cm, abaxially villous, smallest elliptic, ca. 9 × 6.5 mm, glabrous; ovary oblate-obovoid, 6-7.5 × 3.5-4.5 mm, densely brown villous, 2-loculed; placentae axile, bilamellate; styles 2, 2.3-3 mm, fused at base; stigmas 2-cleft, spiraled. Capsule immature, unequally 3-winged; abaxial wing subtriangular; lateral wings smaller. Fl. Oct, fr. Dec.

Yunnan (Mengzi).

● Forests, shaded moist environments; 1700-2500 m.