Description from Flora of China
Herbs perennial, rhizomatous. Stems ascending to erect, 5.5-38 cm tall, densely puberulent, reddish, unbranched, apically leafless. Stem leaves in 2-4(-7) pairs; petiole 0.5-2.2(-4.8) cm; leaf blade elliptic-ovate to broadly elliptic, 1.5-7.4 × 1-4.8 cm, papery, pubescent or hirsute especially on veins, adaxially densely puberulent to hirsute, abaxially green or purplish, base cordate to shallowly cordate, margin undulate-crenate, apex rounded to obtuse. Racemes secund, 5-24 cm; peduncle 2.5-4 cm, densely puberulent; floral leaves sessile to short petiolate, ovate to elliptic, 0.7-2.5 × 0.5-1.5 cm, base rounded-truncate, apex obtuse; bracts ovate, 1.5-3 × ca. 1 mm, pubescent, margin entire. Flowers alternate or opposite. Pedicel purplish, 2.5-3 mm, densely pubescent. Calyx ca. 2 mm, pubescent outside, glandular pubescent; scutellum spreading, semicircular, 0.5-0.8 mm, reflexed, almost as long as calyx in fruit. Corolla purple, glandular pubescent outside, 0.9-1.2 cm; tube 7-10 mm, base bent, gradually dilated to 3 mm wide at throat; limb ca. 3 mm, puberulent or pubescent inside; middle lobe of lower lip ovate-orbicular; lateral lobes ovate to oblong-ovate. Nutlets brown, ovoid-ellipsoid, ca. 1 mm in diam., with acuminate tubercles tipped by a whorl of hooks. Fl. Jun-Nov, fr. Jul-Dec.
Forested hillsides, streamsides, grassy slopes, roadsides; 0-2000 m. Guangxi, Guizhou, Sichuan, Yunnan [Cambodia, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Thailand, Vietnam]