木姜楼梯草 mu jiang lou ti cao

Herbs perennial, dioecious, 20-30 cm tall, glabrous. Stems erect, branched. Leaves alternate; nanophylls absent; stipules subulate, 4-6 × 0.3-0.5 mm, without cystoliths; petiole 1-5 mm; leaf blade lanceolate, 6.5-16.5 × 2-4.5 cm, papery, major basal lateral veins asymmetric, 1 basal, the other arising above base, cystoliths conspicuous, dense; base cuneate, margin entire, apex caudate-acuminate. Male inflorescences solitary, simple, 7-10 mm in diam.; peduncle 2-2.5 mm; receptacle ca. 6 mm in diam.; bracts connate, 3-7 mm; bracteoles linear or spatulate-linear. Male flowers 4-merous. Fl. Apr.

* Evergreen broad-leaved forests, rocks in ravines; ca. 1600 m. SE Xizang.