瘤茎楼梯草 liu jing lou ti cao

Pellionia myrtillus H. Léveillé, Repert. Spec. Nov. Regni Veg. 11: 552. 1913.

Herbs perennial, monoecious or dioecious, 25-40 cm tall. Stems ascending or erect, usually branched, ferruginous-furfuraceous, tuberculate, glabrous. Leaves alternate, glabrous; nanophylls absent; stipules subulate, 1-1.5 × 0.1-0.2 mm, without cystoliths; petiole absent; leaf blade obliquely ovate, 1-3 × 0.5-1 cm, herbaceous, major basal lateral veins both arising at base of leaf blade, cystoliths conspicuous, dense; base with broader half auriculate, margin serrate, apex acuminate. Male inflorescences solitary, simple, 2-5 mm in diam., sessile; receptacle obscure; bracts connate, ca. 2 mm. Female inflorescences solitary, 30-flowered or more, ca. 2 mm in diam., sessile; receptacle obscure; bracts nearly oblong; bracteoles linear. Male flowers 4- or 5-merous. Achenes narrowly ovoid, ribbed. Fl. May-Oct.

* Limestone valleys, streamside rocks; 300-1500 m. W Guangxi, S Guizhou, SW Hubei, NW Hunan, SE Sichuan, SE Yunnan.