樟木秋海棠 zhang mu qiu hai tang

Begonia echinata Royle.

Herbs, deciduous. Tubers globose, 5-8 mm in diam. Stem absent or very short. Leaves 1 or 2, basal or cauline; stipules caducous, ovate-lanceolate, abaxially hairy; petiole 5-8(-15) cm, pubescent on upper part; blade ovate-cordate, slightly asymmetric, 5-8 × 4-7 cm, abaxially hirsute, adaxially sparsely hirsute, venation palmate, 7-veined, base slightly oblique, cordate to deeply cordate, margin bidentate, apex acuminate. Inflorescences terminal, 6-15(-21) cm tall, pubescent; bracts ovate-lanceolate, abaxially pilose. Staminate flowers: pedicel 5-10 mm; tepals 4, pink, outer 2 suborbicular, ca. 9 × 7 mm, abaxially villous, inner 2 elliptic, 5-6 × ca. 2.5 mm; stamens numerous; filaments 0.8-1 mm, fused at base; anthers oblong, ca. 1 mm, apex emarginate. Pistillate flowers: tepals 5, pink, largest broadly obovate, 6-7 × 4-5 mm, smallest elliptic, ca. 3.2 × 1.3 mm; ovary villous, 3-loculed; placentae axile, bilamellate; styles 3, fused at base; stigmas 2-cleft, spiraled. Capsule pendulous, obovoid, ca. 6 mm, unequally 3-winged; abaxial wing lanceolate, ca. 1.5 × 0.4 cm; lateral wings smaller. Fl. Aug-Sep, fr. Sep.

Forest margins, on rocks in shaded moist environments by streams and slopes; 2200-2900 m. Xizang (Nyalam) [N India, Myanmar, Nepal].

This species is similar to Begonia parvula but differs by its bilamellate placentae.