Description from Flora of China
Subshrubs, sometimes climbing. Stems 25-45 cm or more, glabrous. Petiole 1-6 mm or absent; leaf blade oblong to narrowly elliptic, lanceolate, or ovate, 3.5-14 X 2-5.8 cm, thin leathery to papery, glabrous, base broadly cuneate to subcordate, margin serrate, apex acute to acuminate; lateral veins 5-9 on each side of midrib, flat to prominent below. Cymes 2-7-flowered; peduncle 4.5-10 cm, glabrous or with a few hairs; bracts lanceolate to ovate, 3-8 X 1.2-4 mm. Pedicel 4-10 mm. Calyx 5-sect from base; segments 4-6 mm, glabrous, sometimes margin sparsely ciliate. Corolla purple, 2.8-3.4 cm, glabrous; tube slender funnelform, 1.7-2.8 cm X 4-5 mm; adaxial lip ca. 2.5 mm; abaxial lip ca. 9 mm. Stamens 3.5-6 mm; filaments 2.5-5 mm; anthers broadly ovoid; connective unappendaged; staminodes 2, ca. 1 mm. Disc ringlike, margin entire. Pistil ca. 1.4 cm, glabrous. Capsule 5-7.5 cm. Seed appendages hairlike, ca. 1.5 mm. Fl. Aug-Oct, fr. Sep-Oct.
* Terrestrial, epipetric, or epiphytic in forests and streamsides in valleys; 1200-2800 m. NE Yunnan.