Herbs perennial. Stems erect, 25-40 cm tall, purplish red or greenish red. Petiole 1 cm or more, sometimes purple-red, amplexicaul, gray pilose or ciliate only on margin; leaf blade ovate-elliptic to narrowly elliptic, 4-7.5 × 3.2-4 cm, strigose or pilose, base cuneate-decurrent, margin irregularly double dentate, ciliate, apex obtuse to acute. Inflorescences terminal, 5-10 cm, of crowded verticillasters; floral leaves sometimes purplish red, ovate, 1-1.5 cm, base cuneate, margin entire to slightly incised, apex acute. Calyx funnelform-campanulate, 7-8 mm, glabrous; teeth pilose, ciliate, narrowly triangular, 1/2 or more as long as calyx, apically acute, regular. Corolla tube 2 × or more as long as calyx, pilose, puberulent, villous annulate inside; upper lip straight, apex rounded and emarginate; lower lip enlarged, elongated, with middle lobe obcordate and lateral lobes linear-oblong. Nutlets adaxially swollen at middle, areole covering almost entire adaxial side. Fl. Apr-Aug, fr. Jul-Sep.
Streamsides, moist grasslands, moist areas in forests, dense grass; at elevations from 300-2,500 metres.
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