Description from Flora of China
Herbs twining. Stems dull yellow hirsute. Petiole 1.5-3 cm, sparsely villous; leaf blade ovate, 3.5-7.5 X 2-4 cm, glabrous, base cordate, margin entire, apex acute or acuminate, mucronulate. Inflorescences few to many flowered; peduncle 2-3.5 cm, glabrous; bracts persistent, ovate, concave, 3-4 mm, apex acuminate. Pedicel slender, 0.5-1.5 cm. Sepals unequal, glabrous, apex obtuse, apiculate; outer 2 elliptic, ca. 9 mm; inner ones oblong, ca. 1 cm. Corolla pale yellow, broadly funnelform, 1.8-2 cm, midpetaline bands brown veined, outside glabrous. Stamens included; filaments ca. 1 cm, slightly dilated basally, fimbriately scaled; anthers twisted, 3-4 mm. Ovary ovoid-conical, ca. 2 mm, glabrous. Style ca. 3 mm. Capsule unknown.
* Forests on mountain slopes. Hainan.