墨脱楼梯草 mo tuo lou ti cao

Elatostema medogense var. oblongum W. T. Wang; E. shuzhii W. T. Wang.

Herbs perennial, monoecious or dioecious, 7-20 cm tall. Stems ascending or erect, simple or branched, puberulent. Leaves alternate; nanophylls absent; stipules narrowly linear, 1.5-2 × 0.2-0.3 mm, glabrous, without cystoliths; petiole 0-1 mm; leaf blade obliquely elliptic or oblong, 1-3 × 0.5-1.5 cm, herbaceous, major basal lateral veins both arising at base of leaf blade, abaxial surface sparsely strigillose along nerves, adaxial surface glabrous, cystoliths conspicuous or obscure, sparse; base with broader half auriculate, margin crenate-dentate, apex acute. Male inflorescences solitary, simple, 3-7 mm in diam.; peduncle 2-5 cm; receptacle elliptic, 1.5-3.5 mm; bracts connate, 2.5-3.5 mm; bracteoles linear. Female inflorescences solitary, 10-20-flowered, 2-6 mm in diam.; peduncle ca. 1 mm; receptacle 1.5-3.5 mm in diam.; bracts triangular; bracteoles narrowly linear. Male flowers 4-merous. Achenes ovoid, smooth. Fl. May-Aug.

Mountain forests or evergreen broad-leaved forests in valleys; 1600-2600 m. SE Xizang [India].