Begonia modestiflora Kurz

Herbs, deciduous. Tubers subglobose. Stems erect, 14-40 cm tall, glabrous, lower part repent, slender, rooting at nodes. Leaves cauline; stipules ovate, 5-7 mm, membranous, margin denticulate and ciliate, apex acuminate and shortly cuspidate; petiole 1.8-5.5 cm, glabrous; blade triangular, asymmetric, 3.5-8 × 2.5-5 cm, both surfaces glabrous, venation palmate, 5-7-veined, base strongly oblique, shallowly cordate, margin irregularly serrate, apex long acuminate. Inflorescences terminal and axillary, glabrous; terminal inflorescence with distal staminate flowers and basal pistillate flowers; axillary inflorescences with 1 or 2 pistillate flowers; bracts ovate, 6-7 mm, margin denticulate and ciliate, apex acuminate and cuspidate. Staminate flowers: pedicel 6-10 mm; tepals 4, pink, outer 2 broadly ovate, 5-7 × ca. 4.5 mm, glabrous, inner 2 narrowly elliptic, ca. 3 × 1 mm; stamens numerous; filaments fused at base; anthers narrowly elliptic, ca. 1.2 mm, apex acute. Pistillate flowers: bracteole 1, caducous, margin denticulate; tepals 5, unequal, largest broadly ovate, 7-8 × 6-7 mm, glabrous, apex obtuse or acute, smallest narrowly elliptic, 6-7 × ca. 1.5 mm, apex obtuse; ovary glabrous, 3-loculed; placentae axile, bilamellate; styles 3, fused at base; stigmas 2-cleft, spiraled. Capsule pendulous, ca. 10 × 6 mm, unequally 3-winged; abaxial wing triangular, 1.3-1.5 cm; lateral wings smaller. Fl. Aug, fr. Sep.

Yunnan (Jinghong, Simao) [India, Myanmar, Nepal, Thailand].

Forests, shaded moist environments by streams; 500-1400 m.

Begonia yunnanensis H. Léveillé, Repert. Spec. Nov. Regni Veg. 7: 20. 1909; B. yunnanensis var. hypoleuca H. Léveillé.