Climbers. Branches solid or becoming hollow. Branchlets and leaves glabrous. Petiole 2-10 mm; leaf blade elliptic to oblong or obovate, 4.5-11 × 3-6 cm, abaxially glaucous, base attenuate and decurrent to petiole, opposite leaves sometimes slightly fused and perfoliate, margin cartilaginous, apex obtuse. Inflorescence sessile at apices of branchlets with an involucral bract of 1 pair of perfoliate leaves 4-6 cm across, apex acute; flowers sessile and verticillate, 6 per whorl; whorls 1 or 2 clustered into a capitulum; internode below involucral bract 3-6 cm; bracts minute; bracteoles suborbicular, ca. 1 mm, glandular hairy. Ovaries glabrous, sometimes glandular hairy at apex. Calyx lobes broadly ovate, ca. 1 mm, glandular and sometimes sparsely ciliate. Corolla yellow, sometimes red inside, funnelform, 2-4 cm, outside with sparse long stiff hairs and glands, sometimes glabrous, inside puberulent; tube shallowly gibbous at base; lobes subregular, slightly unequal, ovate, 4-8 mm, apex rounded. Stamens inserted slightly below base of corolla lobes. Style exserted, glabrous to puberulent toward base. Berries red, subglobose, ca. 7 mm in diam.; seeds whitish, ellipsoid, ca. 2 mm, pitted. Fl. May-Jun, fr. Jul-Oct.
Can be grown by cuttings. Seeds needs stratification.
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