Herbs perennial, 30-120 cm tall. Stems hollow, sparsely short pubescent. Leaves attenuate to long petiole, (5-)8-9 × (2.5-)5-6 cm, sparsely short pubescent, base cordate, apex acuminate; stem leaves short or indistinctly petiolate, elliptic to ovate, 4-14 × 2-7 cm, base subrounded. Inflorescences bracteate at middle or slightly below. Pedicel thin, 5-10 mm, pubescent. Calyx erect at anthesis, deflexed at fruiting; lobes linear, pubescent outside. Corolla bluish purple, campanulate-tubular, ca. 3 × 9-12 mm; appendages ca. 1.5 mm, densely pubescent on margin; lobes ovate. Anthers oblong, ca. 1 mm. Nutlets unequal, 3 or 4 developed, ca. 4 × 3 mm, adaxially without hairs; abaxially turberculate, with or without stiff bristles, sometimes marginal rib with few prickles. Fl. and fr. Jun-Jul.
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