Herbs perennial, 40-80(-100) cm tall. Roots stout. Stems glabrous or pubescent. Petiole 1-3.5 cm; leaf blade lanceolate, oblong, or ovate, 8-20 × 2.5-9 cm, thick papery, glabrous or rarely pubescent, entire or coarsely 1-or 2-toothed. Flowers nodding or erect; pedicel 1.5-8(-11) cm, glabrous or pubescent. Calyx campanulate to nearly funnelform, 2.5-4 cm; lobes broadly deltate, apex acute or obtuse, somewhat unequal, glabrescent. Corolla purple or dark-purple, sometimes pale yellow-green, resembling calyx in shape, 2.5-3.8 cm, only limb exserted; tube pubescent adaxially, especially at base; lobes half rounded. Stamens less than half as long as corolla; filaments ca. 0.8 mm; anthers oblong, 5-6 mm. Style 1.2 cm. Fruiting pedicel 6-8 cm, erect. Fruiting calyx ca. 6-7.5 cm, with prominent ribs and netted veins. Capsule ca. 2 cm in diam. Fl. May-Jun, fr. Jul-Aug.
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