Plants 30-60(-100) cm tall. Basal leaf blades ovate, 2-4.5 × 1-2 cm. Middle to upper stem leaf apex obtuse, veins 7-9 and arcuate; middle stem leaf blades elliptic to ovate-elliptic, 7-22 × 3-9(-14) cm; upper stem leaf blades ovate-lanceolate, 5-10 × 1.2-3 cm, smaller toward apex. Thyrses 2-8-flowered. Pedicel 3-6(-16) cm. Calyx campanulate, 2.7-3.2 cm, tube 6-8 mm; lobes ovate-lanceolate, 2-2.6 cm, apex acuminate, veins 3-5. Corolla pale yellow-green, with brown veins, 5-7 × 4-5 cm, tube 8-10 mm; lobes oblong-spatulate, 4-6 cm, apex obtuse. Filaments 1.2-1.4 cm; anthers 1-1.2 cm. Style 1.5-1.8 cm; stigma lobes ellipsoid. Capsules ovoid-ellipsoid, 5-6 cm. Seeds 2.2-2.5 mm; seed coat longitudinally rugose. |