Piper glabricaule C. de Candolle, Notizbl. Bot. Gart. Berlin-Dahlem 6: 477. 1917.

Subshrubs to more than 1.5 m high, glabrous except for rachis and bases of bracts. Stems terete, usually smooth. Petiole 3-6 mm on wider side; leaf blades elliptic, narrowly elliptic, or oblong, rarely those toward base of stem broadly elliptic, 15-21 × 6-9.5 cm, papery, base with bilateral difference 2-3 mm; veins 9 or 10. Female spikes 6-8 cm. Drupe 1.2-1.7 mm in diam. Fl. Dec-Mar.

* Valleys or wet places within forests; 1300-1700 m. S Yunnan