Begonia yui Irmsch.

This species is similar to Begonia labordei but differs by its pistillate flowers with 2 bracteoles.

Herbs, deciduous. Tubers globose, 1.5-1.8 cm in diam. Leaves 1(or 2), basal or sometimes 1 cauline; stipules caducous, ovate, membranous, margin ciliate; petiole 4-12 cm, pilose or subglabrous; blade ovate or broadly ovate, slightly asymmetric, 6-11(-14) × 5-7.5 cm, abaxially pilose, adaxially densely villous, venation palmate, 5- or 6-veined, base slightly oblique, shallowly cordate, margin minutely serrulate, apex shortly caudate. Inflorescences terminal, racemose at base, 13-20 cm tall, subglabrous; bracts ovate or oblong, 4-7 × 2-3.5 mm, membranous, glabrous, margin finely glandular serrate near apex, apex obtuse or rounded. Staminate flowers: pedicel ca. 1 cm; tepals 4, pink, outer 2 broadly ovate, ca. 8 × 6.5 mm, abaxially villous, inner 2 elliptic, ca. 5.5 × 3 mm; stamens numerous; filaments 1-1.5 mm; anthers obovoid or oblong, 0.7-0.8 mm, apex emarginate. Pistillate flowers: pedicel 1.5-2 cm; bracteoles 2; tepals 5, variable in shape; ovary villous, 3-loculed; placentae axile, bilamellate; styles 3, fused at base; stigmas U-shaped. Capsule pendulous, obovoid, 7-8 × 5-6 mm, unequally 3-winged; abaxial wing triangular; lateral wings smaller. Fl. Aug-Sep, fr. Sep.

Yunnan (Lincang, Zhenkang).

● On rocks in moist environments by stream banks in valleys; (1500-)2500-2900 m.