Description from Flora of China
Subshrubs. Stems 7-100 cm, glabrous to puberulent. Petiole 1-4(-15) mm; leaf blade linear to broadly elliptic, oblanceolate to obovate, or rarely lanceolate to ovate, 1.5-6(-9) X (0.4-)0.8-2(-3.8) cm, leathery, glabrous, rarely puberulent, base narrowly to broadly cuneate, rarely rounded, margin apically serrate to crenate, dentate, or subentire, basally subentire, apex acute to subtruncate; lateral veins 3-6 on each side of midrib, often obscure, flat. Cymes 1-3(-12)-flowered; peduncle 0.3-2.6(-5) cm, glabrous; bracts linear to ovate or oblanceolate, 1-4 X 0.4-1 mm. Pedicel 3-10(-17) mm. Calyx 5-sect from to near base; tube to 1 mm; segments (1-)2-7(-8) mm, glabrous, sometimes sparsely puberulent or with a few hairs at tip. Corolla white to light purple or pink, inside with purple lines and sometimes yellow throat, 2.8-5.5 cm, outside glabrous to puberulent basally, inside glabrous; tube slender funnelform, 2.1-3.5 X (0.7-)1.2-1.5 cm; adaxial lip 3-5 mm; abaxial lip (0.7-)0.9-1.5 cm. Stamens 1-1.7 cm; filaments 1-1.6 cm; anthers oblate to broadly ovoid; connective appendage hornlike, ca. 0.5-1(-3) mm; staminodes (2 or)3, 0.6-5(-8) mm. Disc ringlike to cupular, to 4 mm, entire or with few acute to obtuse teeth. Pistil 1.2-2.8 cm, glabrous. Capsule (1.7-)4.5-13 cm. Seed appendages hairlike, 0.7-2 mm. Fl. Jun-Dec, fr. Aug-Jan.
Forests, thickets, rocks, or cliffs, terrestrial, on trees or rocks in hilly or montane regions; 300-2200 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, S Henan, Hubei, Hunan, S Jiangsu, Jiangxi, S Shaanxi, Sichuan, Taiwan, Yunnan, Zhejiang [Japan, N Vietnam].