刚毛秋海棠 gang mao qiu hai tang

Begonia tsaii Irmscher.

Herbs. Rhizomes elongate, ca. 6 mm in diam. Leaves basal; stipules broadly ovate or triangular-ovate, 5.5-7 × 4-5 mm, glabrous, apex cuspidate; petiole 6-12 cm, densely brown villous; blade broadly ovate to suborbicular, asymmetric, 5-11 × 4.5-9 cm, abaxially hirsute when young, adaxially red setose, venation palmate, 7- or 8-veined, base cordate, margin indistinctly serrulate, apex shortly caudate, rarely acute. Inflorescences 20-30 cm tall, brown villous; bracts ovate, 4-10 × 2.4-8 mm, margin ciliate, apex obtuse. Staminate flowers: pedicel 1.3-1.4 cm; tepals 4, pink, outer 2 broadly ovate to suborbicular, 0.6-2.2 × 1.6-1.8 cm, abaxially pilose, inner 2 oblong, 1.1-1.2 cm × 3.8-4.1 mm; stamens numerous; filaments 2-2.5 mm; anthers elliptic or obovoid, 1-1.4 × ca. 1.7 mm, apex emarginate. Pistillate flowers: pedicel 8-9 mm; ovary broadly ovoid, 7-8 × 6-7 mm, villous, 3-loculed; placentae axile, bilamellate; tepals 5, unequal, largest suborbicular, 1.1-1.5 × 0.9-1.3 cm, glabrous, smallest oblong, 6.5-3.5 mm; styles 3, 3-3.8 mm; stigmas 2-cleft, spiraled. Capsule nodding, ovoid, unequally 3-winged; abaxial wing subtriangular, 6-7 mm; lateral wings narrowly triangular, 2-3 mm. Fl. May, fr. May.

● Broad-leaved forests, in shaded moist environments; 1300-2100 m. SE Yunnan.

This species is similar to Begonia ruboides but differs by its rhizomatous habit.