Herbs perennial, 15-30(-60) cm tall, glabrescent. Leaves alternate, simple; petiole 2-5(-15) cm; leaf blade ovate-elliptic, 6-8(-20) X 3-6(-15) cm, papery, base and apex subrounded, margin crenate; lateral veins 7-9 on each side of midrib. Inflorescences racemose, 6-12-flowered, terminal; peduncle 2-4 cm; bracts 5-12 mm. Pedicel 5-10 mm. Calyx campanulate, 1.4-2 cm; teeth 2-4 X 7-10 cm, apex acute. Corolla red, ca. 5.5 X 3 cm; tube 4.5-5 cm, purple-red striate and spotted adaxially; lobes rounded, 1.4-1.8 X 1.8-2.2 cm. Capsule lanceolate, compressed, 4-angled, 4-6(-9) cm X 5-7 mm, apex acuminate. Seeds ovoid, 5-6 X 3-4 mm; wing ca. 1 mm wide. Fl. May-Jul, fr. Aug-Nov.
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