细角楼梯草 xi jiao lou ti cao

Herbs perennial, dioecious, 20-50 cm tall. Stems erect, simple, densely pubescent. Leaves alternate; nanophylls absent; stipules narrowly linear, 7-11 × 1.5-2 mm, sparsely puberulent, without cystoliths; petiole 2-5 mm; leaf blade obliquely oblong or obovate-oblong, 7-11.5 × 2.5-4 cm, herbaceous, major basal lateral veins absent and venation pinnate, abaxial surface puberulent, adaxial surface sparsely strigillose; cystoliths obscure, dense; base with broader half auriculate, margin densely dentate, apex acuminate or caudate. Male inflorescences solitary, simple, 6-8 mm in diam.; peduncle 6-12 mm; receptacle obscure; bracts connate, 4.5-7.5 mm; bracteoles lanceolate-linear. Female inflorescences solitary, 30-flowered or more, 3-6 mm in diam.; peduncle 0-1 mm; receptacle 2-4 mm in diam.; bracts broadly ovate; bracteoles spatulate-linear. Male flowers 5-merous. Achenes ellipsoid, ribbed. Fl. Apr-Jun.

* Valley thickets, forests, on rocks; 1100-2200 m. W Sichuan.