A herbaceous twiner. Stems terete or striate, glabrous or hirsute. Leaves ovate, ovate-deltoid, oblong, oblong-lanceolate or linear-oblong, 5-12 by 1-6 cm, cordate-sagittate or hastate at the base with rounded or acutish auricles, acuminate or attenuate to the obtuse, emarginate and minutely mucronate apex, glabrous; petiole 1-5 cm long, mostly glabrous, smooth, or sometimes minutely warty. Inflorescences axillary; peduncles nearly absent to 5 (-9) cm long, cymosely one-to few-flowered at the top. Pedicels more or less angular, 1.25-3 cm, thickened in fruit. Bracts ovate or ovate-oblong, acuminate, mucronulate, 5-15 mm long. Sepals herbaceous, unequal, the outer ones longer, 15-20, in fruit up to 25 mm long, ovate, acute to acuminate, mucronulate (mucro filiform), with broad incurved margins, their back strongly 3-keeled; keels more or less irregularly dentate; inner sepals ovate, acuminate, mucronulate, about ¾ as long as the outer ones, not keeled. Corolla funnel-shaped, c. 4 cm long, glabrous, pale purple with a deep purple centre. Stamens and style included; filaments pilose in their basal portion. Ovary glabrous. Capsule ovoid or globose, c. 1.5 cm long, 4-valved, the valves pale brown outside, whitish inside. Seeds c. 5 mm long, black, minutely puberulent.
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Herbs twining, with glabrous or hirsute axial parts. Stems glabrous or nodes hirsute. Petiole 1-5 cm, sometimes minutely tuberculate; leaf blade cordate-sagittate to narrowly hastate, 5-12 X 1-6 cm, glabrous, apex acuminate, mucronulate; lateral veins 5 or 6 pairs. Inflorescences axillary, 1-to few flowered; peduncle 5(-9) cm or shorter; bracts 2, ± ovate, 0.5-1.5 cm, glabrous. Pedicel angular, 1.3-3.5 cm. Sepals unequal; outer 3 larger, attenuate-ovate to lanceolate, 1.5-2.2 cm, margin incurved, apex mucronate, strongly 3-keeled abaxially, keels toothed basally, glabrous. Corolla purplish to red, with a darker center, narrowly funnelform, 2.5-4 cm, glabrous. Stamens included; filaments pilose below middle. Ovary conical, glabrous. Style filiform, ca. 5 mm; stigma capitate, 2-lobed. Capsule pale brown outside, whitish inside, ovoid to globose, 1-1.5 cm. Seeds black-brown, ovoid, ca. 5 mm, densely tomentellous.
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