Description from Flora of China
Trees 5-15 m tall. Young branches, leaves, and peduncles yellow-brown pubescent to tomentose. Leaves 30-55 cm; leaflets 4-8 pairs, long elliptic to elliptic-ovate, 12-23 X 4-9 cm, base broadly cuneate to subrounded, sometimes oblique, margin entire to serrulate, apex acute to acuminate; lateral veins 8 or 9 on each side of midrib; petiolules 1-4 mm or leaflets subsessile. Inflorescences terminal racemes, rusty yellow pubescent, 4-10-flowered. Flowers 10-14 cm in diam. Pedicel 2-6 cm. Calyx ca. 5.5 X 4 cm, brown-yellow tomentose to floccose. Corolla yellow to dirty yellow, ca. 10 cm; tube red-brown or purple on lower part, 1.5-2 cm in diam. at base; mouth 10-15 cm in diam.; lobes irregularly wrinkled. Stamens and style included. Capsule linear, compressed, 30-70 X 2-3 cm. Seeds long ellipsoid, including wing 3-5 X 1-1.3 cm. Fl. Sep-Dec, fr. Jan-Apr.
Sparse forests, humid places; 300-1700 m. Fujian, Guangdong, Guangxi, Hainan, Yunnan [Cambodia, Laos, Myanmar, Thailand, Vietnam].