Elatostema alnifolium W. T. Wang

Herbs perennial, dioecious, ca. 36 cm tall. Stems erect, simple or branched, densely strigose. Leaves alternate; nanophylls absent; stipules linear, ca. 10 × 1.5 mm, hirtellous on abaxial surface, with cystoliths on adaxial surface; petiole 1-2 mm; leaf blade obliquely elliptic or obovate, 8-12 × 4.5-7 cm, herbaceous, major basal lateral veins absent and venation pinnate, abaxial surface densely strigillose along nerves, adaxial surface glabrous, cystoliths conspicuous, dense; base with broader half broadly cuneate, margin undulate or rarely entire, apex short acuminate. Male inflorescences in pairs, simple, 12-24 mm in diam.; peduncle 3-4 mm, densely strigillose; receptacle papilionaceous, 12-20 mm; bracts connate, ca. 1.5 mm; bracteoles narrowly linear. Female inflorescences solitary, nearly orbicular, 3.5-7 mm in diam.; peduncle ca. 1 mm, densely strigillose; receptacle 2.5-6 mm in diam. Male flowers 5-merous. Achenes ellipsoid, 5-ribbed. Fl. May-Jul.

SE Yunnan.

* Streamsides; ca. 1200 m.

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

桤叶楼梯草（学名：Elatostema alnifolium）为荨麻科楼梯草属的植物，为中国的特有植物。分布在中国大陆的云南等地，目前尚未由人工引种栽培。