163. Begonia villifolia Irmscher, Notes Roy. Bot. Gard. Edinburgh. 21: 43. 1951.
长毛秋海棠 chang mao qiu hai tang
Herbs, to 80 cm tall. Rhizomes poorly developed, only seen in young stage. Stems to 1.5 cm in diam., densely long hirsute. Leaves cauline; stipules oblong-ovate, to 3.7 cm, membranous, abaxially villous, apex cuspidate; petiole to 36 cm, densely long-hirsute; blade broadly ovate to ovate, rarely narrowly ovate, asymmetric, 9-34 × 7-25 cm, densely long villous, venation palmate, 6-veined, base oblique, cordate, margin densely and irregularly serrate, shallowly lobed, divided to 1/3 of leaf length; lobes 3 or 4, apex long acuminate or caudate-acuminate. Inflorescences 5-6 cm, densely villous; bracts caducous, hairy. Staminate flowers: pedicel 1-3 cm; tepals 4, white, outer 2 broadly obovate, 1.2-2.9 × 0.8-2.2 cm, abaxially villous, inner 2 obovate, 2.6-2.7 × ca. 1.7 cm; stamens ca. 400; filaments 1.1-3.5 mm, free; anthers elliptic, 1.8-3.1 mm, apex acute. Pistillate flowers: pedicel 1-2.1 cm; tepals 5, subequal, variable in shape, 0.8-2.1 × 0.6-1.7 cm, abaxially villous; ovary densely villous, 2-loculed; placentae axile, bilamellate; styles 2, fused at base, 4.8-9 mm; stigmas 2-cleft, spiraled. Capsule nodding, ellipsoid, 9-11 × 6-7 mm, unequally 3-winged; abaxial wing elliptic to orbicular, 2-3 cm; lateral wings smaller, 4-5 mm. Fl. May-Jul, fr. Jul.
Forests or scrubby vegetation, on rocks of shaded moist slopes or along streams; (1100-)1600-1700 m. SE Yunnan [Myanmar, Vietnam].