Plants 30-50 cm tall. Roots terete, ca. 2 cm in diam. Stems much branched, glandular pubescent. Petiole 1-6 cm; leaf blade ovate, ovate-elliptic, ovate-deltate, or deltate, 4-13 × 3-8 cm, sparsely glandular pubescent, base cuneate, cordate, or sometimes truncate, margin entire and sinuate, apex obtuse or somewhat acute. Inflorescences few flowered, paniculate; bracts leaflike, 0.5-1.5 cm. Pedicel 1-1.5 cm. Calyx short campanulate or tubular-urceolate, glandular pubescent, ca. 6 × 5 mm; lobes deltate, ca. 2 mm. Corolla yellow with purple veins, campanulate or tubular-campanulate, ca. 2-3 cm. Stamens somewhat unequal, exserted; anthers ca. 2 mm. Style exserted. Fruiting calyx thick, tubular to campanulate or urceolate, 2.5-3.5 cm, slightly inflated near base, contracted and tubular upwards, teeth erect, slightly spreading, subequal, ca. 3.5-6 mm. Capsules oblong, 1.2-1.5 cm. Seeds subreniform, somewhat compressed, ca. 3.5 × 2.5 mm. Fl. Jun-Jul, fr. Jul-Aug.
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