Shrubs to 16 m tall, climbing, densely stellate tomentose to stellate pubescent throughout. Petiole ca. 5 mm; leaf blade oblong-obovate, oblong-elliptic, or obovate, 9.5-21 × 4-8.5 cm, membranous, secondary veins 13-18 on each side of midvein, base narrowly and shallowly cordate, apex acuminate, obtuse, or sometimes rounded. Inflorescences leaf-opposed, 1- or 2-flowered; bracts ovate, ca. 7 × 3.5 mm. Flowers ca. 3.5 cm in diam. Pedicel 2.5-4 cm, bracteolate at middle. Sepals broadly ovate, ca. 5 × 5-6 mm. Petals yellow to yellowish; outer petals ovate to obovate-oblong, ca. 1.6 × 1.1-1.2 cm, apex rounded; inner petals as large as outer petals. Anthers oblong, ca. 3 mm; connectives apically truncate, puberulent. Carpels oblong, ca. 4 mm; ovules 10 per carpel, in 2 series; stigmas horseshoe-shaped, apex 2-cleft. Monocarps ovoid to subglobose, 2-3 × ca. 2 cm; epicarp densely tawny brown pubescent, not spiny. Fl. May, fr. Jul-Aug.