Herbs to 1 m. Stems slender, glabrous or sometimes puberulent. Petiole 5-10 mm, adaxially pubescent; leaf blade oblong or oblong-lanceolate, 2.5-4 × 0.8-1.3 cm, thin papery, glabrous except for adaxially puberulent midvein, base retuse-cordate, apex acute; lateral veins 3 or 4 pairs. Inflorescences ca. 2.5 cm, 10-16-flowered; peduncle 1-1.5 cm, rachis simple, less often forked, zigzag, glabrous; cymules ± umbel-like. Pedicel 2-6 mm, glabrous; sepals oblong, ca. 1 × 0.5 mm, ciliate; glands 5. Corolla greenish, rotate, sparsely and minutely puberulent; tube short; lobes broadly ovate, ca. 3 × 3 mm. Corona lobes ovate, apex reaching anther base. Anthers nearly square; appendages broader than long, rounded; pollinia globose, horizontal. Stigma head discoid, apex elevated. Fl. May.

* Forests. Guangxi, S Guizhou.