Description from Flora of China
Herbs erect, bearing stolons. Stems ca. 1 m, rigid, slender, retrorse strigose, apex few branched, with internodes longer than leaves. Petiole narrowly winged, dilated at apex, 1-2.5 cm; leaf blade lanceolate, 5-10 × 1.7-3.3 cm, reduced apically, thin papery, adaxially sparsely strigose, densely so on veins, abaxially densely strigose, golden glandular, base attenuate, decurrent into petiole or leaves sessile, margin crenate-serrate above base, apex acute to acuminate. Verticillasters (2-)4-8(-12)-flowered; bracteoles minute, subulate or obsolete. Calyx obconical, ca. 1.2 cm, densely retrorse strigose, obscurely 10-veined; teeth subulate, almost as long as tube. Corolla white with purple-spotted lower lip or yellow, ca. 1.5 cm; tube included, ca. 5 mm, glabrous, pilose annulate inside; upper lip erect, pilose, oblong, apex rounded, concave, ca. 2 × as long as tube; lower lip somewhat wider, spreading. Ovary subglabrous. Fl. Jun-Jul.
* Dense forests, shady streamsides; 300-1400 m. Guangdong, Guangxi, Guizhou, Hubei, Hunan, Sichuan, Taiwan(?).