Woody climbers, to 3.5 m, evergreen. Young branches striate, glabrous; old branches dark brown, waxy; bud scales broadly ovoid. Petiole 7-15 mm; leaf blade abaxially pale green, adaxially green, becoming black when dried, ovate, elliptic-ovate, or elliptic, 4-7 × 2-4 cm, papery, both surfaces glabrous, lateral veins 3-5 pairs, base rounded or broadly cuneate, apex acute or obtuse. Cymes 4-or 5-flowered, umbelliform, 2-3 cm, glabrous; peduncles 1-1.5 cm. Pedicel 4-7 mm. Sepals 5, triangular-ovate, 0.5-1 mm, ciliate. Petals 5, yellow, ovate or elliptic-ovate, 2-4 × 1.5-2 mm, 4-7-veined. Stamens 5, 2-3.5 mm; filaments flattened; anthers extrorse. Disk cup-shaped. Ovary glabrous. Schizocarp red or purplish red, obovoid, orbicular, or subreniform, compressed, 5-6.5 × 5.5-7 mm; endocarp with distinct midrib, keeled, with foveolate only at margin. Fl. Mar-Apr, fr. May-Aug.
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