Climbers. Branches hollow. Branches, petioles, and peduncles densely yellow pubescent and sometimes glandular. Petiole 2-8 mm; leaf blade ovate to elliptic, 2-7.5 × 1.5-4 cm, leathery, both surfaces sometimes pubescent on midvein, veins raised abaxially, base rounded to cordate, apex acute to acuminate. Flowers fragrant, paired and axillary toward apices of branchlets, forming racemes; involucral bracts large, peduncle 1-10 mm; bracts, bracteoles, and calyx lobes pubescent; bracts lanceolate, 0.5-3 mm; bracteoles minute, orbicular-ovate. Neighboring 2 ovaries free, elliptic, ca. 2 mm, glabrous. Calyx cupular; lobes triangular, ca. 0.5 mm, apex acute. Corolla bilabiate, white, later yellow, 3-4.5 cm, outside glabrous to pubescent; tube narrowly funnelform, slightly curved, 2.5-4 cm, 1-2 mm in diam., not gibbous at base; upper lip 4-lobed, 2 lateral lobes split to middle, middle ones only slightly lobed. Stamens and style slightly exserted from corolla tube. Style sparsely puberulent. Berries red, globose, ca. 5 mm in diam. Fl. Feb-Apr, fr. May.
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