昌感秋海棠 chang gan qiu hai tang

Begonia cavaleriei var. pinfaensis H. Léveillé; B. esquirolii H. Léveillé; B. nymphaeifolia T. T. Yü.

Herbs, rhizomatous. Rhizomes elongate, 5-15 mm in diam. Leaves basal; stipules caducous, broadly ovate to reniform, 8-12 × 8-10 mm; petiole 7-25 cm, glabrous; blade peltate, nearly symmetric, ovate or broadly elliptic, 8-15(-22) × 5-13(-19) cm, thickly papery, glabrous, venation palmate, base obtuse, margin slightly repand, apex acuminate to caudate. Inflorescences to 30 cm tall, glabrous; bracts reniform to fan-shaped, 8-15 × 12-16 mm, glabrous, apex emarginate; flowers fragrant. Staminate flowers: pedicel ca. 1 cm; tepals 4, white to pinkish, outer 2 broadly ovate to ovate, 8-20 × 9-15 mm, glabrous, inner 2 oblong, 1.2-4.1 × 4.4-7.1 mm; stamens 58-72; filaments free, 0.7-2 mm; anthers obovoid to oblong, 0.7-1.1 mm, apex rounded or slightly emarginate. Pistillate flowers: pedicel 2-3 cm; tepals 3, outer 2 broadly ovate or suborbicular, 1.1-1.8 × 1.4-1.7 cm, glabrous, inner 1 oblong, 7.8-8.5 × ca. 4 mm; ovary oblong, to 2 mm, glabrous, 3-loculed; placentae axile, bilamellate; styles 3, to 4.6 mm, fused at base; stigmas 2-cleft, spiraled. Capsule nodding, oblong, to 2.9 mm, unequally 3-winged; adaxial wing larger, lunate, 7-8 mm; lateral wings smaller. Fl. May-Jul, fr. Jul. 2n = 30*.

Forests, on limestone rocks; 700-1300(-1800) m. Guangxi, Guizhou, Yunnan [Vietnam].