Description from Flora of China
Herbs perennial, rhizomatous. Stems 20-60 cm tall, ascending, ± woody and leafless at base, unbranched, densely pubescent. Leaves elliptic to obovate or subcircular, 2-8 × 1.3-3.5 cm, ± leathery, adaxially glabrous or very sparsely pubescent, abaxially densely gray pubescent, 3-veined at base, whitish along veins abaxially, base cuneate-attenuate to rounded, margin entire to inconspicuously few crenate or 4-8-undulate-dentate, apex obtuse to acuminate. Racemes terminal, 4-18 cm; bracts rhombic-obovate, to slightly longer than pedicel, puberulent. Pedicel 4 mm, glandular puberulent. Calyx ca. 2.5 mm, ca. 4 mm in fruit, glandular puberulent; scutellum open, semicircular, ca. 1.8 mm, to 5 mm in fruit, conspicuously veined. Corolla purple or purple-blue, 2-3 cm, sparsely puberulent; tube 2-2.3 cm, bent at base, throat to 7 mm wide; upper lip ovate, ca. 5 mm wide; middle lobe of lower lip subcircular, ca. 4.5 mm in diam., apex emarginate; lateral lobes ovate, ca. 3 mm wide. Nutlets tuberculate. Fl. May-Jun, fr. Jun-Jul.
* Forests, thickets, rice paddy margins, streamsides; 600-2500 m. Guangxi, Guizhou, Hubei, Sichuan