钝叶楼梯草Elatostema obtusum Wedd.

科名：荨麻科 Urticaceae

属名：楼梯草属 Elatostema

《中国植物志》第23(2)卷264页
  71. 钝叶楼梯草（秦岭植物志） 图版49: 7-10（见243页）
  Elatostema obtusum Wedd. in Ann. Sci. Nat. ser. 4, 1: 190. 1854;in DC. Prodr. 16 (1): 187. 1869; Hook. f. Fl. Brit. Ind. 5: 573. 1888; Hand. -Mazz. Symb. Sin. 7: 147. 1929; 秦岭植物志1 (2): 111, 图94.1974; 湖北植物志1: 174. 1976; W. T. Wang in Bull. Bot. Lab. N. -E. For. Inst. 7: 64. 1980; 西藏植物志1: 551. 1983; 云南种子植物名录, 上册, 722.1984; 贵州植物志4: 59. 1989.

《Flora of China》 Vol. 5 (2003)
Elatostema obtusum  Weddell
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].