Description from Flora of China
Rhizomes to 10 cm. Stems herbaceous, erect, 30-150 cm tall, terete, wingless or rarely winged, basally glabrous, apically with multicellular glandular hairs; branches rarely developed. Leaves alternate, sessile, narrowly elliptic, 10-20 X 3-5 cm, glabrous or adaxially sparsely puberulent, base cuneate to rounded and sometimes slightly amplexicaul, margin dentate to serrate, apex acuminate to caudate-acuminate. Inflorescences terminal, often 1, occasionally 2 or more, long caudate, axis densely glandular with multicelluar hairs. Corolla white, yellow-white, grayish yellow, or orange-yellow, 6-8 mm, arching 30° forward; tube apically hairy inside; limb 2-3 mm, conspicuously 2-lipped, unequally lobed; lower lip linear-lanceolate, reflexed; upper lip 3-lobed, middle lobe ovate-orbicular and straight or galeate, lateral lobes erect or reversed toward lateral-posterior position. Stamens exserted; filaments hairy or sometimes glabrous; anthers to 2.5 mm. Capsule ovoid-globose, ca. 4 mm. Seeds angular; seed coat thick, transparent, reticulate. Fl. Jul-Sep.
Ravines, shaded slopes with grasses, under forests; 1500-3000 m. Guizhou (Fangjing Shan, Panxian Tequ), W Hubei, Sichuan, Xizang (Mainling Xian), Yunnan [Bhutan, Nepal, Sikkim].