糙叶秋海棠 cao ye qiu hai tang

Herbs, deciduous. Tubers subglobose, 1.3-2 cm in diam. Leaves 1(or 2), basal, occasionally with short stem; stipules caducous; petiole (8-)15-23(-28) cm, subglabrous or tomentose; blade broadly ovate, asymmetric, 15-20(-30) × 11-18(-20) cm, abaxially pubescent, more densely so on veins, or rusty tomentose, adaxially sparsely pubescent or densely strigose, venation palmate, 6-8-veined, base slightly oblique, cordate, margin irregularly serrulate, undivided or very shallowly lobed. Inflorescences terminal, racemose at base, 12-25 cm tall, subglabrous; bracts oblong-ovate to ovate, 5-6 × 1-1.2 cm, membranous, apex obtuse. Staminate flowers: pedicel 1-1.5(-2.5) cm; tepals 4, pink, glabrous, outer 2 suborbicular, 1.1-1.3 × 1-1.2 cm, inner 2 oblong to ovate-oblong, 8-10 × 5-7 mm; stamens numerous; filaments free; anthers oblong. Pistillate flowers: pedicel 2-2.5 cm; tepals 5, pink, unequal, obovate to suborbicular, 5-11 × 3-9 mm, glabrous; ovary elliptic, ca. 7 × 5 mm, glabrous, 3-loculed; placentae axile, bilamellate; styles 3, free; stigmas U-shaped, slightly spiraled. Capsule pendulous, oblong to obovoid-oblong, unequally 3-winged; abaxial wing triangular or obliquely so, 1.2-1.4(-1.9) cm; lateral wings 3-4 mm, rarely absent or reduced to very narrow lamellae. Fl. Aug-Oct, fr. Sep-Nov.

● Broad-leaved forests, mixed broad-leaved and coniferous forests, along streams, rocky slopes; (1500-)1800-3400 m. SE Xizang, W Yunnan.

Similar to Begonia labordei, this species differs by its large, somewhat rugulose leaves and 5-tepaled pistillate flowers (in B. labordei, the pistillate flowers have 3(or 4) tepals). Some specimens of intermediate size and lacking pistillate flowers are difficult to identify.