Climbers to 8 m tall, most parts reddish pubescent. Petiole 6-8 mm; leaf blade oblong-lanceolate to oblong-elliptic, 6.5-16 × 1.8-3.8 cm, thinly leathery to thickly papery, abaxially glabrous, adaxially sparsely pubescent, secondary veins 14-21 on each side of midvein and adaxially impressed, base shallowly cordate, apex acute. Inflorescences leaf-opposed or alternate, cymose, 1-5-flowered. Pedicel 1.5-2 cm, 2-bracteolate at base. Sepals ovate-oblong, ca. 6 mm, reddish tomentose. Petals yellowish; outer petals ovate-oblong, ca. 18 × 7 mm, outside densely reddish tomentose, inside glabrous; inner petals ovate-lanceolate, ca. 13 × 4 mm, glabrous, inside basally concave. Stamens oblong; connectives broadly 3-angular. Carpels densely villous; ovules ca. 7 per carpel, in 2 series; styles oblong, pubescent; stigma apex entire. Fruiting pedicel ca. 1.2 cm, reddish pubescent; monocarp stipes ca. 2.7 cm; monocarps globose, 2-2.5 cm in diam., densely villous. Fl. Mar-Nov, fr. Jun-Dec.