Description from Flora of China
Phanera pyrrhoclada (Drake) de Wit.
Lianas, woody. Young branches, inflorescences, petioles, and abaxial leaf surfaces rusty pubescent; tendrils pubescent. Stipules sickleform, caducous; petiole 2.5-3.5 cm; leaf blade ovate-orbicular, 6-8.5 × 6-8.5 cm, subleathery, abaxially thickly rusty pubescent, later losing most of its pubescence and color, adaxially glabrous except on primary veins, primary veins 9-11, base cordate, apex bifid to 1/2 on flowering branches, lobes obtuse at apex. Inflorescence a raceme, pyramidal, flowers dense; peduncle prominent, terminal; bracts and bracteoles linear-lanceolate, ca. 11 × 2.5-3 mm, pubescent. Pedicel 7-30 mm, stout, rusty pubescent. Flower buds ovoid, 10-12 mm, pubescent, apex obtuse. Receptacle funnelform, 5-7 mm; calyx lobes 5, not reflexed, lanceolate, velutinous, acuminate. Petals white, obovate-elliptic, ca. 20 × 10 mm with a claw ca. 5 mm, abaxially rusty hairy, margin crisped. Fertile stamens 3; filaments ca. 20 mm, hairy at base. Staminodes 2 or 3. Ovary subsessile, hairy; style 6-7 mm, lower part hairy; stigma peltate. Legume oblanceolate-oblong, compressed, 10-18 × 4-4.6 cm; valves hard woody, velutinous. Fl. Jun, fr. Aug-Sep.
Open habitats. Hainan, Yunnan [N Vietnam].