Subshrubby climbing herb; stems ± pubescent.. Leaf-blade oblong-ovate, up to 18(–24) cm. long and 9(–12.5) cm. wide, obtuse or subacute at the apex, truncate, rarely cordate at the base, with traces of floccose pubescence above, densely velvety beneath with yellowish-white tomentum; petiole 5(–8) cm. long, densely tomentose.. Flowers several in a dense cyme; peduncle 2 cm. long; pedicels 1–1.5 cm. long; bracts oblong-obovate, thinly velvety, 3.5–4.5 cm. long, 1.6–4 cm. wide.. Sepals elliptic, 1.2–1.5 cm. long, 5 mm. wide, tomentose.. Corolla crimson, funnel-shaped, (3.8–)6 cm. long.