俞氏楼梯草 yu shi lou ti cao

Herbs perennial, dioecious, 23-45 cm tall. Stems ascending or erect, usually simple, densely ferruginous-furfuraceous. Leaves alternate; nanophylls absent; stipules linear-lanceolate, 5-9 × 0.5-1 mm, glabrous, without cystoliths; petiole 0-2 mm; leaf blade obliquely elliptic or obliquely oblong, 2.5-11 × 1-3.5 cm, herbaceous, major basal lateral veins both arising at base of leaf blade or 1 arising above base, abaxial surface strigillose along veins, adaxial surface glabrous, cystoliths conspicuous or obscure, dense; base with broader half auriculate, margin dentate, apex acuminate or caudate-acuminate. Male inflorescences in pairs, simple, ca. 5 mm in diam.; peduncle ca. 2 mm; receptacle 3-4 mm in diam.; bracts connate, 2-6.5 mm; bracteoles cymbiform-oblong or linear. Female inflorescences solitary, sessile, 4-7 mm in diam.; receptacle 4-6 mm in diam.; bracts triangular; bracteoles linear. Male flowers 4-merous. Achenes ellipsoid, 6-ribbed. Fl. Jul-Aug.

* Evergreen broad-leaved forests in valleys, Tsuga chinensis forests, streamsides; 1900-2800 m. NW Yunnan.