光滑秋海棠 guang hua qiu hai tang

Herbs, 29-42 cm tall. Rhizomes to 2.5 cm in diam. Stems erect, seen only at anthesis, glabrous. Leaves basal and cauline; stipules caducous; petiole to 30 cm, glabrous; blade ovate-cordate, nearly symmetric, 8-19 × 6-13 cm, glabrous, base slightly oblique, rounded or slightly cordate, margin remotely and minutely serrulate, apex caudate. Inflorescences glabrous; peduncle 8-17 cm; bracts elliptic to ovate-oblong, 7-9 × 4-5 mm, glabrous. Staminate flowers: pedicel 1.2-1.4 cm tepals 4, pink to dark red-brown, outer 2 elliptic, 10-13 × 7-8 mm, inner 2 obovate-oblong, 8-12 × 3-7 mm; stamens 70-90; filaments 0.7-2.1 mm; anthers oblong, 0.7-2.9 mm. Pistillate flowers: pedicel 0.9-1.1 cm; tepals 5, subequal, oval, largest 6-10 × 4-7 mm, smallest 6-9 × 4-5 mm; ovary glabrous, 2-loculed; placentae axile, bilamellate; styles 2, 2.6-4.2 mm, fused to halfway; stigmas 2-cleft, spiraled. Capsule nodding, ellipsoid, 8-10 mm, unequally 3-winged; abaxial wing falcate, 12-15 × ca. 9 mm, apex rounded; lateral wings smaller. Fl. Feb. 2n = 23*.

● Forests, on limestone rocks in shaded moist environments; 100-700 m. Yunnan (Hekou).