Vines, herbaceous, to 3 m; stems quadrangular or narrowly 4-winged, sparsely retrorsely aculeolate on angles. Leaves opposite; petiole 1-4(-6) cm, retrorsely aculeolate and sometimes ferruginous hirtellous; blade drying thickly papery to leathery, light green and ± ferruginous, particularly below and on main veins, ovate, lanceolate, or oblanceolate, larger leaves 4-12.5 × 1.5-5(-7) cm, smaller 2-3 × 1-2 cm, glabrous to hirtellous, retrorsely aculeolate at least along veins on both surfaces, base rounded to cordate, margins serrulate-aculeolate, apex acuminate; principal veins 3 or mostly 5; stipules conspicuous, persistent, ± broadly ovate, (5-)10-60 × (4-)8-40 mm, acuminate. Inflorescences predominantly axillary, with several-to many-flowered cymes; axes glabrous to hirtellous, sparsely aculeolate; bracts ovate or sublanceolate, 1-5 mm; pedicels 1-4 mm. Ovary ca. 1 mm, glabrous to glabrescent. Corolla yellow to green, 5-merous, cup-shaped to campanulate, 3.5-4.5 mm in diam., papillose to ± hairy outside; tube 0.8-1.3 mm; lobes triangular-ovate, 1.5-1.7 mm, caudate. Mericarp berry black, 4-5 mm in diam. Fl. Jun-Jul, fr. Aug-Oct.
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