Lianas, woody, with compressed, glabrous tendrils. Stems and branches black when dry, cylindric, covered with small pits; young branches canaliculate, brownish red puberulent. Stipules caducous; petiole ca. 2 cm, glabrous; leaf blade adaxi­ally shiny, ovate, broadly ovate, or suborbicular, 5-7 × 4-7 cm, subleathery, abaxially brownish pubescent when young, subgla­brous when old, adaxially glabrous, primary veins 7-9, veins dense, convex on both surfaces, base cordate, entire, or emar­ginate; lobes rounded or obtuse. Inflorescence a raceme or 5-9 racemes joined in a panicle, terminal or axillary, 9-15 cm, many flowered, brownish pubescent; peduncle short; bracts linear, 2.5-4 mm; bracteoles linear, inserted at middle of pedi­cel. Pedicel 3.5-4 mm, pubescent. Flower buds broadly ellip­soid. Receptacle funnelform, short; calyx lobes 5, ovate-trian­gular, ca. 2 × 1.5 mm, glabrous upon anthesis, reflexed. Petals white, ovate-oblong, elliptic, or broadly elliptic, 3-4 × 2.2-3 mm, margin wrinkled, claws 2-2.5 mm. Fertile stamens 3; filaments glabrous. Staminodes 2. Ovary stalked, oblique, hairy on sutures and stalk; style glabrous; stigma small. Legume unknown. Fl. Jul.

● Open forests on karst hills. Guangxi.