Roots carrot-shaped, 15-20 × 0.5-1.2 cm. Stems erect or ascending, 35-70 cm, few branched, subglabrous or sparsely white villous. Leaves on main stems alternate, those on branches subopposite; petiole 0.5-1.5 cm, sparsely white villous; blade broadly ovate, ovate, or subelliptic, 3-7 × 2-4.5 cm, abaxially hispidulous but hirsute along veins, adaxially hispidulous, base cordate, truncate, or rounded, margin sparsely crenulate, apex acute or obtuse. Calyx tube fully adnate to ovary; lobes triangular or ovate, 11-16 × 6-8.5 mm, margin dentate, sparsely ciliate, apex acute or obtuse; sinus between calyx lobes acute. Corolla pale yellow-green or pale blue, broadly campanulate, 1.5-2.3 × 1.5-2.5 cm, glabrous; lobes ovate-deltoid, ca. 1/3 as long as tube. Filaments slightly dilated at base, 2-3 mm; anthers ca. 5 mm. Capsules semiglobose below, broadly conical above, ca. 8 mm in diam., rostrum 4-6 mm. Seeds numerous, yellow, ellipsoid, ca. 1.5 mm, wingless. Fl. Jul-Aug, fr. Sep-Oct. 2n = 16.
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