Corolla red-purple or crimson, funnel-shaped, the tube not at all slender, 7–7.5(–9) cm. long, hairy outside when in bud, later glabrescent (Fig. 22/9, p. 102).
Sepals suborbicular, truncate at the apex, finely white-tomentose or rarely glabrescent, 1.3–2 cm. long, 0.9–1.1 cm. wide.
Stout liane; stems angular, pubescent or glabrescent, twining, up to 9 m. long.
Flowers several in a lax cyme; peduncles 1–2 cm. long; pedicels about 1.6 cm. long.
Leaf-blade ovate, slightly cordate, entire or slightly lobed to deeply pinnately or subpalmately divided into 5–11 lobes, 7.5–16 cm. long, 7.5–14(–30) cm. wide, green and glabrous above, with mottled white pubescence below, mainly on the veins, strongly bullate; lobes oblong, up to 8 cm. long and 1.5 cm. wide; petiole 5–7.5 cm. long.