Rootstocks a cluster of fusiform roots. Stems twining to 1 m, slender, densely crisped pubescent. Petiole ca. 1 cm, pubescent; leaf blade lanceolate, 10-13 × 2-3 cm, base cune-ate, adaxially crisped pubescent, abaxially glabrous except for midvein. Inflorescences lax branched, many flowered; peduncle (1.5-)2.5-4 cm. Pedicel ca. 1 cm, glabrous or sparsely pubescent. Sepals linear-lanceolate, 3-4 mm, glabrous. Corolla 2.7-3 cm, glabrous; tube ca. 2 cm, base fusiform, to 2.5 mm wide; tube < 1 mm wide, throat only slightly dilated, narrower than basal swelling; lobes linear-oblong, 7-9 mm. Outer corona teeth 2-lobed, ciliate; inner lobes linear-oblong. Follicles lanceolate, ca. 9 cm. Fl. Aug.
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