Climbers to 10 m tall. Bark grayish black. Branches brown tomentose when young, glabrous and lenticellate with age. Petiole 1-1.5 cm, densely hispid to tomentose; leaf blade ovate-oblong, elliptic-oblong, or obovate-oblong, 9-18 × 3.2-8 cm, leathery, abaxially brown hispid, adaxially glabrous except for hispid midvein, secondary veins 16-20 on each side of midvein, obliquely ascending to margin, and adaxially impressed, main tertiary veins prominent and parallel, reticulate veins inconspicuous, base rounded to broadly cuneate, apex acute and apiculate. Inflorescences mostly leaf-opposed, in subumbellate glomerules, often 10-flowered or more; peduncle 3-10 mm; bracts oblong-ovate, 5-6 × 3-4 mm, abaxially brown tomentulose, adaxially glabrous. Pedicel 1-2 cm, fulvous tomentulose, 1- or 2-bracteolate below middle. Flower buds conic. Sepals ovate, 5-7 × 3-4 mm, outside tomentulose, inside glabrous. Outer petals ovate-triangular to ovate-lanceolate, 13-17 × 7-8 cm, outside fulvous tomentulose, inside glabrous; inner petals ovate-lanceolate, 10-11 × 4-5 mm, outside pubescent, inside glabrous. Stamens oblong; connectives ovoid-triangular. Carpels 4-6, ovate-oblong, ca. 3 mm, densely hispid; ovules 8-10 per carpel, in 2 series; styles elongate, inclining; stigma apex 2-cleft. Monocarp stipes ca. 3 cm; monocarps globose, ca. 1.5 cm in diam., tomentulose. Fl. Mar-Jun, fr. Aug-Nov.