120. Begonia platycarpa Y. M. Shui & W. H. Chen, Acta Bot. Yunnan. 27: 368. 2005.
扁果秋海棠 bian guo qiu hai tang
Herbs, rhizomatous. Rhizome 4-10 cm, 2-3 mm in diam., sparsely hirsute, hairs 2-3 mm; internodes 5-9 mm. Leaves all basal; stipules mostly persistent, reflexed, triangular, 6-8 × 3-4 mm, adaxially densely pilose; petiole 5-10 cm, hirsute (hairs 3-5 mm); blade very broadly ovate, 6-8 × 4-5.5 cm, papery, abaxially sparsely pilose (hairs 3-4 mm) on veins and glabrous on other parts, adaxially densely pilose (hairs ca. 3 mm), basally 6-veined, base obliquely deeply cordate, margin serrulate and with cilia 3-4 mm, apex obtuse. Inflorescences 12-15 flowers in a dichasial cyme; peduncle 5-8 cm, sparsely pilose (hairs ca. 3 mm); bracts obovate or ovate, 4-7 × 2-3.5 mm, abaxially sparsely pilose, margin ciliate, apex rounded or acute. Staminate flowers: tepals 4, outer 2 pink, suborbicular, 1-1.5 cm in diam., apex with red stripes, outside sparsely pilose, inner 2 white or pinkish, obovate, 1.2-1.6 × 4-6 mm; stamens numerous; filaments free, 1-1.1 mm; anthers yellow, obovoid, 1.2-1.3 × 0.5-0.7 mm, apex subemarginate. Pistillate flowers: tepals (2 or)3(or 4), pink, outer 2 orbicular, 1-1.3 cm in diam., apex with red stripes, outside sparsely pilose (hairs ca. 2 mm), inner pinkish, obovate, 0.8-1.1 × 3-5 mm; ovary broadly ovoid-ellipsoid, 3-winged, sparsely pilose (hairs ca. 2 mm), 1-loculed with parietal placentation; styles 3, ca. 2 mm, base slightly fused, stigmas spirally twisted. Capsule nodding, orbicular, compressed, 7-8 mm in diam., glabrescent, styles persistent; wings 3, equal, lunate, 1.5-2.2 mm. Fl. Mar-Jun.
● At foot of limestone hills; ca. 900 m. Yunnan (Guangnan).