Elatostema laevissimum W. T. Wang

Subshrubs monoecious or dioecious, 50-200 cm tall. Stems erect, branched, glabrous or densely puberulent. Leaves alternate; nanophylls absent; stipules narrowly triangular, 2-5 × 0.8-1 mm, glabrous, without cystoliths; petiole 2-4 mm; leaf blade obliquely elliptic, 5.5-12 × 3-5.5 cm, herbaceous, major basal lateral veins both arising at base of leaf blade or 1 arising above base, abaxial surface glabrous or pilose along nerves, adaxial surface sparsely strigillose, cystoliths absent or only present along primary nerve and secondary nerves; base with broader half rounded, margin crenate, apex acuminate. Male inflorescences usually 2- or 3-clustered, simple, 3-4 mm in diam.; peduncle 1.5-2 mm; receptacle absent or very small; bracts connate, ca. 0.8 mm. Female inflorescences 1.5-2.5 mm in diam.; peduncle 0-1; receptacle absent or very small; bracts broadly ovate; bracteoles oblong or linear. Male flowers 4-merous. Achenes ovoid, 5-ribbed. Fl. Aug-Feb.

W Guangxi, Hainan, SE Xizang, Yunnan [N Vietnam].

Dark damp places or forests in valleys; 1000-2200 m.

Elatostema laevissimum var. puberulum W. T. Wang.

Elatostema laevissimum là loài thực vật có hoa trong họ Tầm ma. Loài này được W.T.Wang mô tả khoa học đầu tiên năm 1980.

光叶楼梯草（学名：Elatostema laevissimum）是荨麻科楼梯草属的植物。分布于越南以及中国大陆的云南、广西、海南、西藏等地，生长于海拔1,000米至1,600米的地区，见于山谷阴湿处和林中，目前尚未由人工引种栽培。