78. Begonia laminariae Irmscher, Notes Roy. Bot. Gard. Edinburgh. 21: 40. 1951.
圆翅秋海棠 yuan chi qiu hai tang
Herbs. Rhizomes 8-13 mm in diam. Leaves basal; stipules not seen; petiole 35-50 cm, brown villous, more densely so on upper part; blade suborbicular or oblate-orbicular, slightly asymmetric, 18-35 × 19-35 cm, glabrous or subglabrous, venation palmate, 7-9-veined, base slightly cordate, margin remotely and irregularly serrulate, deeply divided to 2/3 of leaf length; lobes 7-9, apex acuminate or long caudate. Inflorescences glabrous or hairy; bracts ovate, glabrous, acuminate. Staminate flowers: tepals 4, glabrous, outer 2 orbicular, ca. 1.3 × 1.1 cm, inner 2 oblong, ca. 11 × 6-7 mm; stamens numerous. Pistillate flowers: tepals 5, glabrous, unequal, largest orbicular, ca. 1.5 × 1.3 cm, smallest obovate, ca. 14 × 8-9 mm; ovary glabrous, 2-loculed; placentae axile, bilamellate; styles 2, fused at base; stigmas 2-cleft, spiraled. Capsule nodding, ellipsoid to oblong, 18-20 × 8-10 mm, unequally 3-winged; abaxial wing ligulate or broadly oblong, 9-16 mm, apex rounded; lateral wings 2-6.5 mm. Fl. Jun, fr. Sep. 2n = 22*.
Forests or scrubby vegetation, shaded moist environments; 1200-1800 m. Guizhou (Anlong), SE Yunnan [Vietnam].
This species is similar to Begonia paucilobata but differs by its 7-9-lobed leaves, which are deeply divided to ca. 2/3 of the leaf length.