Lianas to 1.5 m. Stems, branches, and petioles pubescent along 1 line. Petiole 1-1.5 mm; leaf blade linear, 3-7 cm × 1-2 mm, thin papery, glabrous, base subcordate, apex acute; midvein puberulent, elevated; lateral veins obscure. Cymes extra-axillary, shorter than leaves, 3-12-flowered, up to 3 together; peduncle 1.5-3 cm, glabrous. Pedicel slender, 6-10 mm. Sepals puberulent, basal glands 5. Corolla subcampanulate, glabrous; tube ca. 1 mm; lobes oblong, as long as tube, acute. Corona short 5-toothed. Pollinia reniform. Ovaries oblong, glabrous. Fl. May.

* Thickets; ca. 2500 m. Sichuan (Kangding).