Asarum caudigerellum C. Y. Cheng & C. S. Yang

This species is used medicinally.

Herbs. Rhizomes horizontal, 2-3 mm in diam., internodes 3.5-8 cm. Leaves paired on flowering module, solitary on nonflowering modules; petiole 4-10 cm, glabrous; leaf blade uniformly colored, cordate, 3-7 × 4-10 cm, abaxial surface pubescent along veins, adaxial surface sparsely pubescent, base cordate, lateral lobes 1-3 × 2-4 cm, apex acuminate; cataphylls broadly ovate, 1.5 -2 × 1-1.5 cm. Peduncle ascending to pendent, 1-1.5 cm. Calyx actinomorphic, brownish purple, campanulate, 1.8-2.7 × 0.8-1.4 cm; sepals connate beyond attachment to ovary, abaxially sparsely white villous; tube subglobose, 0.6-1.2 × 0.9-1.5 cm; lobes spreading, triangular, 0.7-1.0 × 0.7-1.6 cm. Stamens 12; filaments slightly longer than anthers; connectives extended beyond anthers, ligulate. Ovary inferior. Styles connate, slender, apex 6-cleft; stigmas terminal. Fl. Apr-May.

Guizhou, Hubei, Sichuan, NE Yunnan.

* Thickets, along streams, moist places; 1600-2100 m.