叉序楼梯草 cha xu lou ti cao

Subshrubs dioecious, ca. 50 cm tall. Stems erect, branched, pubescent. Leaves alternate; nanophylls absent; stipules linear-lanceolate, 3-5 × 0.5-0.8 mm, puberulent, without cystoliths; petiole 0.2-2 mm; leaf blade obliquely elliptic, 5.5-11 × 2.3-4.5 cm, papery, major basal lateral veins asymmetric, 1 basal, the other arising above base, both surfaces sparsely strigillose along nerves; cystoliths conspicuous, dense; base with broader half broadly cuneate, margin dentate, apex caudate-acuminate or acuminate. Male inflorescences solitary or in pairs, simple, 2-3 mm in diam.; peduncle 1.2-2.5 mm; receptacle obscure; bracts connate, 1-1.5 mm; bracteoles cymbiform-linear. Male flowers 4-merous. Fl. Jan.

Valley thickets; ca. 100 m. Yunnan (Hekou) [Bhutan].