Strong woody twiner with densely pubescent young stems and glabrescent yellowish older ones. Leaf-blade ovate, up to 16(–23) cm. long and 15 (–20.5) cm. wide, acute or blunt at the mucronate apex, shallowly cordate or truncate, glabrous or very sparingly pilose above, very densely grey-velvety beneath to glabrous or glabrescent; lateral nerves closely parallel; petiole up to 17 cm. long. Inflorescences axillary, many-flowered; peduncle. 0.8–1 (–2.5) cm. long; pedicels 0.6–1.0 cm. long. Calyx-lobes elliptic or suborbicular, 7–10(–13) mm. long, 5–8(–12) mm. wide, blunt or emarginate, mucronulate, glabrescent above, hairy towards the base. Buds finely pubescent at the tips. Corolla very bright crimson with base of tube orange-yellow, funnel-shaped, not markedly narrowed basally, 4.5–5.5 cm. long, with tufts of hairs at the tips of the midpetaline areas. Capsule 1.4 cm. long, 1.3 cm. wide, globose. Seeds black, ± granular, 6 mm. long, 4 mm. wide. Fig. 19, p. 70.