Plants 45-85(-180) cm tall. Basal leaf blades ovate-lanceolate to ovate, 2-5 × 1-1.5 cm. Middle to upper stem leaf apex acuminate to obtuse, veins 5-7 and arcuate; middle stem leaf blades elliptic-lanceolate, 10-30 × 3-6 cm; upper stem leaf blades linear-lanceolate, 5-7 × 0.7-1.2 cm, smaller toward apex. Thyrses 7-11-flowered. Pedicel 2.5-6 cm. Calyx campanulate, 2.7-3.2 cm, tube 2-3 mm; lobes elliptic-lanceolate, 2.5-3 cm, margin narrowly membranous, apex acuminate, veins 3-5. Corolla white or pale yellow, with brown veins, 5-6 × 6-7.5 cm, tube 8-10 mm; lobes oblong-spatulate, 4-5 cm, base slightly contracted, apex rounded. Filaments 1.3-1.5 cm; anthers 7-10 mm. Style cylindric, 4.5-5.5 mm; stigma lobes ovate-orbicular. Immature capsule ovoid-ellipsoid, 1.5-1.8 cm. Seed coat reticulate and warty. Fl. and fr. Sep-Oct.
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