Description from Flora of China
Stems herbaceous, twining to 3.5 m, sparsely pilose along 1 or 2 sides. Petiole ca. 1.2 cm, narrowly winged, pilose; leaf blade lanceolate, 5-12(-17) × 1.2-3 cm, abaxially glaucous and glabrous except for midvein, adaxially appressed pubescent, base rounded or cuneate, apex acute to acuminate; lateral veins 6 or 7 pairs. Inflorescences umbel-like, 4-8-flowered; peduncle 0.9-2.7(-3.5) cm. Pedicel 1-1.5 cm. Sepals linear, ca. 4 mm, glabrous. Corolla purplish, 2.2-3.6 cm; basal inflation 4.5-6.5 mm wide, tube 1.6-3.2 mm wide, expanding to 4.5-8.5 mm wide at base of lobes; lobes oblong, (0.7-)1-1.3 cm, pale at base, terminal 5-6 mm purple, puberulent. Outer corona lobes divided into pairs of linear teeth; inner corona lobes erect, linear.
ca. 2100 m. Xizang, Yunnan [India, Myanmar, Nepal, Sikkim]