Lianas to 3 m, many branched, glabrous except for sparsely pubescent abaxial leaf veins, peduncles, pedicels, and exterior of calyx. Petiole 1.5-5 cm; leaf blade ovate, 5-15 × 2.5-8 cm, membranous, base rounded or cordate, apex acuminate or acute; lateral veins 6 or 7 pairs. Cymes patent, at least as long as leaves, many flowered. Peduncle 2-5 cm; secondary peduncles 3-10 cm; cymule rachis 0.5-1.5 cm. Pedicel 0.5-1.5 cm. Sepals ovate, ca. 2 × 1.5 mm, ciliate. Corolla yellow, veined; tube ca. 3 mm, minutely papillate; lobes ca. 5 × 4 mm, broadly ovate. Follicles 9-12 × 3.5-4 cm. Seeds ovate or suborbicular, ca. 1.3 × 1 cm; coma ca. 3.5 cm.

Forest valleys; low to medium elevations. Guangdong, Hainan [Cambodia].