27. Begonia clavicaulis Irmscher, Mitt. Inst. Allg. Bot. Hamburg. 10: 500. 1939.
腾冲秋海棠 teng chong qiu hai tang
Herbs, erect. Rhizomes short, stout, ca. 2.5 cm in diam. Stems ca. 60 cm. Leaves all cauline; stipules caducous; petiole 4-14 cm, sparsely villous; blade oblong-ovate or oblong, asymmetric, 9-10 × 4.5-9 cm, very thin when dried, sparsely hirsute, venation palmate, 8-veined, base oblique, deeply cordate, margin denticulate, shallowly divided, 6- or 7-lobed, apex acuminate. Inflorescences few flowered, glabrous; bracts broadly elliptic to oblong, 4.6-8 × 5-5.8 mm, margin ciliate, apex acute or obtuse. Staminate flowers: pedicel 4-6 mm; tepals 4, outer 2 broadly ovate, 8-9 × 6-8 mm, outside sparsely pubescent, inner 2 broadly elliptic, 5-6 × 4-5 mm, glabrous; stamens numerous; filaments 1.3-1.8 mm, fused at base; anthers obovoid, 0.4-0.6 mm, apex emarginate. Pistillate flowers: tepals 5, unequal, largest one broadly ovate, 6-7.3 × 4.5-7 mm, outside pubescent, smallest one broadly elliptic, 5-6 × ca. 4 mm, glabrous; ovary obliquely elliptic, 4-4.8 × 3-3.8 mm, unequally 3-winged, 3-loculed; placentae axile, bilamellate; styles 3, free; stigmas 2-cleft, spiraled. Mature fruit not available.
● Shaded moist environments; ca. 2100 m. Yunnan (Tengchong).
This species is similar to Begonia wenshanensis but differs by being a larger plant with oblong-ovate or oblong leaf blades.