Description from Flora of China
Herbs annual. Stems erect, to 1 m, striate, branched, appressed pubescent, densely so at apex. Petiole 1-3 cm; leaf blade ovate- to lanceolate-oblong, 5.5-15 × 2.5-8 cm, ± membranous when dry, adaxially sparsely puberulent to finely hirtellous, abaxially puberulent, rust colored glandular, densely pubescent on veins, base rounded to decurrent, margin serrate to crenate-serrate, apex acuminate. Spikes ovoid-oblong to cylindric, 1-4 × ca. 1 cm, pedunculate, apically grouped into panicles. Calyx ovoid, ca. 4 × 2 mm in fruit, base dilated, pubescent, rust colored glandular outside; teeth minute, posterior tooth subulate, clawlike, recurved. Corolla bluish; tube slender, exserted, recurved at middle, dilated at throat; upper lip 3-lobed, middle lobe emarginate; lower lip entire, concave. Nutlets ca. 1 mm in diam., brownish and golden glandular. Fl. Oct, fr. Nov-Dec.
Grassy hills, forest margins; 1200-1700 m. Yunnan [India, Laos, Myanmar, Vietnam].