Description from Flora of China
Stems to 60 cm, glabrous to very sparsely puberulent. Leaves opposite, rarely alternate, spread along stem, unequal in a pair; petiole 0.5-12 cm, sparsely appressed villous, glabrescent; leaf blade ovate to obovate, rarely lanceolate, 4-15.5 X 2.4-8.4 cm, adaxially sparsely appressed strigose to pubescent, abaxially nearly glabrous, sparsely appressed pubescent along veins base sometimes oblique, cuneate to rounded, margin irregularly serrate, apex acuminate to acute; lateral veins 7-10 on each side of midrib, conspicuous. Cymes 1-12-flowered; peduncle 5.5-10.5 cm, sparsely glandular pubescent; bracts 2(or 3), lanceolate to oblong, 3-8 X 1-2 mm, outside sparsely pubescent, inside glabrous, margin entire to sparsely denticulate. Calyx segments lanceolate to narrowly ovate, 0.7-1.4 cm X 1-4 mm, outside pubescent to villous, margin entire, veins indistinct. Corolla white, inside purple spotted, 3-4.5 cm, outside sparsely pubescent, inside sparsely pubescent on adaxial lip; tube 2.6-3.4 X 1-1.5 cm; adaxial lip 4-6 mm, lobes semiorbicular, 3-4 X ca. 6 mm, apex rounded; abaxial lip 1-1.9 cm, lobes semiorbicular, ca. 4 X 4-5 mm, apex rounded. Adaxial stamens adnate to corolla ca. 1 cm above base, ca. 1.5 cm, abaxial ones adnate to corolla ca. 1.2 cm above base, ca. 1.5 cm; filaments glabrous; anthers globose, thecae not confluent. Pistil 2.6-2.8 cm; ovary pubescent. Style 1.3-1.5 cm, sparsely pubescent to puberulent. Capsule 5.5-7 cm, glabrescent. Fl. Aug, fr. Oct.
* Shady and damp places under forests of slopes; 2200-2500 m. Sichuan (Butuo Xian, Kangding Xian).