Lianas to 8 m, glabrous. Petiole 1-1.5 cm; leaf blade oblong or narrowly so, 7-15 X 2-4 cm, apex caudate-acuminate, acumen 5-10 mm; lateral veins 20-25 pairs, subparallel, subhorizontally spreading. Cymes 4-5.5 cm; peduncle 3-4 cm; bracts and bracteoles triangular, ca. 2 mm. Pedicel 2-3 mm. Sepals ovate, ca. 3 mm, subacute. Corolla white, tube ca. 7 mm; lobes broadly ovate, ca. 3 3 mm. Anthers oblong-lanceolate, ca. 2 mm; disc glabrous. Fruit ovoid, 2-3 X 1.5-3 cm. Fl. spring-summer.

Mixed forests, forest edges; 800-1400 m. S Yunnan [Laos, Thailand, Vietnam].