Description from Flora of China
Herbs perennial, erect, to 50 cm tall. Stems subquadrangular, upper part and inflorescences copiously minutely brown glandular. Leaves alternate; upper leaves 1--2 X as large as lower leaves; petiole 5--10 mm, weakly winged, glandular; leaf blade oblong to elliptic-lanceolate, 2.5--10 X 0.8--4 cm, abaxially glabrous, minutely glandular, adaxially ± bristly, base cuneate, margin obscurely undulate and sparsely bristly, apex acute; veins 5 or 6 pairs; veinlets obscure. Racemes terminal and axillary, to 12 cm; peduncle 4.5--7 cm; bracts leaflike, lanceolate, subsessile or short-stalked; lowest bracts to ca. 20 X 5 mm, gradually reduced to ca. 5 mm. Pedicel 0.8--2 cm. Flowers subverticillate. Calyx lobes ovate, ca. 3.5 mm, glandular on margin, inside, and outside, apex subulate. Corolla yellow; tube ca. 1 mm; lobes ovate-elliptic, ca. 5 X 3 mm, apex obtuse. Filaments connate basally into a ca. 1 mm high ring, free parts very short; anthers ca. 2 mm, basifixed, opening by apical pores. Ovary ovoid; style ca. 3 mm. Capsule globose, ca. 3 mm in diam. Fl. Jun-Jul.
* Wet areas in woodlands, streamsides; 500--800 m. SW Guizhou, SE Yunnan.