Roots carrot-shaped, 15-20 × 0.5-1 cm. Stems erect, 40-100 cm, simple or sparingly branched, sparsely pubescent, eventually glabrescent. Leaves on main stems alternate, those on branches opposite; petiole 1-7(-10) cm, sparsely villous; blade abaxially gray-green, adaxially green, ovate, elliptic, narrowly elliptic, or lanceolate, 2-8(-13) × 1-3.8(-5) cm, abaxially glabrous or sparsely villous along veins, adaxially sparsely puberulent or glabrous, base rounded, obtuse, cuneate, or attenuate, margin dentate or crenate, apex acute or obtuse. Flowers terminal or axillary, often 1-4 at tops of stems and branches, long pedicellate. Calyx tube adnate to ovary up to middle, semiglobose, 10-ribbed, sparsely villous; lobes triangular or narrowly elliptic, 5-8 × 2-3 mm, glabrous, margin serrulate or crenulate, apex acute. Corolla yellowish or greenish white with red-purple veins, or red-purple with yellowish spots, broadly campanulate, 1.5-3 × 2-4 cm, 5-fid to middle, both sides glabrous or sparsely villous at apex of lobes. Stamens glabrous; filaments dilated at base, 6-8 mm; anthers 4-5 mm. Capsule obconic at base, conical at apex, 14-15 mm. Seeds brown-yellow, ovoid, smooth. Fl. and fr. (Apr-)Jul-Oct.
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