Begonia longistyla Y. M. Shui & W. H. Chen

Herbs, rhizomatous. Rhizomes 7-10 cm × 2-4 mm, sparsely hairy. Leaves all basal; stipules generally persistent, reflexed, triangular; petiole 3-5 cm, densely strigose; blade ovate, 6-10 × 4-6 cm, papery, rugose, abaxially densely hairy on veins, adaxially densely tuberculate based pilose-setulose, base obliquely deeply cordate, margin serrulate and ciliate, apex obtuse. Inflorescences with 20-40 flowers in a dichasial cyme; peduncle 4-8 cm, glabrous; bracts ovate, apex mucronate. Staminate flowers: pedicels 7-8 mm, glabrous; bracteoles ovate, 2-3 × 1-1.5 mm, apex obtuse; tepals 4, glabrous, outer 2 green, orbicular, 4-5 mm in diam., inner 2 greenish, obovate, 4.5-5 × 3-3.5 mm; stamens numerous; filaments fused up to half from base; anthers obovoid, 0.3-0.4 × 0.3-0.4 mm, apex emarginate. Pistillate flowers: tepals 3, glabrous; ovary coniform, 7-8 × 3-4 mm, glabrous, 3-winged, apex with beak 1.5-2 mm, 1-loculed with parietal placentation; styles 3, usually fused up to half from base. Capsule nodding, ovate, 6-7 × 3-4 mm, with 3 persistent styles; wings 3, subequal, lunate, glabrous. Fl. Feb-Jun, fr. from Apr-Jun.

Yunnan (Gejiu, Hekou).

● Limestone slopes in dense broad-leaved forests, at streamsides; 200-300 m.