钝叶楼梯草 dun ye lou ti cao

Herbs perennial, dioecious, 10-50 cm tall. Stems ascending or creeping, branched or simple, nearly glabrous, very sparsely retrorse-hirtellous, or crispately strigose. Leaves alternate; nanophylls absent; stipules lanceolate-linear, 2-3 × 0.1-0.2 mm, glabrous, without cystoliths; petiole 0-1.5 mm; leaf blade obliquely obovate, obliquely obovate-elliptic, or oblong-obovate, 0.5-1.5(-3) × 0.5-1.2(-1.6) cm, herbaceous, major basal lateral veins both arising at base of leaf blade, both surfaces glabrous or adaxial surface sparsely strigillose; cystoliths conspicuous or obscure, dense; base with broader half cordate, margin dentate, apex obtuse or rounded. Male inflorescences solitary, simple, 4-7 mm in diam.; peduncle 0.2-2(-6.5) cm; receptacle very small; bracts connate, ca. 2.5 mm; bracteoles absent. Female inflorescences solitary, 1(or 2)-flowered, 2-3 mm in diam., sessile; receptacle absent; bracts lanceolate; bracteoles absent. Male flowers 4-merous. Achenes narrowly ovoid, smooth. Fl. Jun-Sep.

Forests, streamsides, rocks; 700-3000 m. Fujian, S Gansu, N Guangdong, N Guangxi, SE Guizhou, W Hubei, NW and SE Hunan, W Jiangxi, S Shaanxi, Sichuan, Taiwan, SE Xizang, Yunnan, S Zhejiang [Bhutan, NE India, Nepal, Philippines, Sikkim, Thailand].