Begonia austrotaiwanensis Y. K. Chen & C. I. Peng

Herbs, deciduous; rhizomes elongate, moniliform. Leaves basal; stipules triangular, 7-22 × 4-9 mm; petiole to 40 cm, glabrous; blade broadly ovate, asymmetric, 13-38 × 10-32 cm, venation palmate, 6-10-veined, base obliquely cordate, margin irregularly serrate, shallowly lobed, apex acuminate or apiculate. Inflorescences to 55 cm tall; peduncle to 42 cm; bracts caducous, in pairs, narrowly ovate to elliptic, 8-12 × 3.5-6.5 mm, glabrous, margin dentate, apex acute. Flowers scented. Staminate flowers: tepals 4, pink or purplish, outer 2 suborbicular to orbicular, 1.3-3.5 × 0.9-3.2 cm, inner 2 lanceolate to narrowly obovate, 1-3.2 cm × 6-8 mm; stamens numerous; filaments free; anthers obovoid. Pistillate flowers: tepals (2 or)3(or 4), outer 2 suborbicular or oblate-orbicular, 1.6-2.3 × 1.4-3.7 cm, inner 1 oblanceolate or obovate, 1.2-2.3 × 0.7-2.3 cm; ovary glabrous, 2-loculed; placentae axile, bilamellate or 4-cleft; styles 2, free; stigma 2-cleft, spiraled. Capsule nodding, unequally 3-winged; abaxial wing ligulate, 2.7-4.6 × 0.9-1.5 cm; lateral wings smaller. 2n = 38*.

S Taiwan.

● Rocky slopes in shaded moist environments; 200-1000 m.