Herbs perennial, glabrous nearly throughout. Stems 60-120 cm, solitary, internodes sometimes longer than leaves. Basal leaves absent; stem leaves conspicuously long petiolate except for a few upper floral leaves; petiole ciliolate; leaf blade oblong-lanceolate, to 15 cm including petiole, smaller and sometimes subcircular in upper leaves, membranous, glabrous or sparsely strigose, base rounded or sometimes cordate, margin serrate-crenate, apex acute. Verticillasters few, ca. 6-flowered. Flowers sessile. Calyx minutely hispid, slightly oblique, ca. 1 cm, conspicuously 5-veined; teeth broadly triangular, rigid, apex obtuse. Corolla red or white, ca. 1.9 cm; upper lip galeate, hirsute outside; lower lip oblong, undulate, lateral lobes smaller. Stamens included; filaments dilated below middle, puberulent. Nutlets subglobose, glabrous, adaxially ribbed (specimens not seen).

Rhizomes edible.

* Garden margins; ca. 1800 m. Hubei, Sichuan.