Stems twining, to 1.5 m, pale gray, glabrous. Petiole to 1 cm; leaf blade linear-lanceolate, 5-12 × 0.5-2 cm, base cuneate, ciliate, adaxially sparsely pubescent, abaxially glabrous, ± glaucous. Inflorescences (1-or)2-7-flowered; peduncle 0.2-3 cm, sparsely pubescent. Pedicel 1-1.5 cm, glabrous. Sepals linear-lanceolate, 5-6 × ca. 1.5 mm, glabrous. Corolla (2.2-)3-4.7 cm, glabrous outside; tube streaked and blotched purplish maroon, inflated base 4-6.5(-10) mm wide, narrowing to (1.3-)2-4.5 mm and then widening to 4-12(-16) mm at base of lobes; lobes (0.8-)1-2.2(-2.5) cm, base ± triangular, pale, apical part slender, darker, coherent at apex, keeled, pilose inside, sometimes with conspicuous white or purple marginal vibratile hairs. Corona usually glabrous, outer 10-lobed, sometimes ciliate; inner lobes twice as long, linear-lanceolate, obtuse. Follicles linear-lanceolate in outline, ca. 10 cm × 5 mm. Fl. Jul-Aug, fr. Sep-Oct.
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