Roots carrot-shaped, 13-20 × 0.5-1.5 cm. Stems erect, simple or with elongate branches in lower part, 40-90 cm, sparsely hairy, eventually glabrescent. Leaves on main stems alternate, those on branches opposite, sessile or with short petiole less than 1 cm; blade abaxially gray-green, adaxially green, ovate, elliptic, or lanceolate, 4-8.5 × 1.5-3.5 cm, abaxially densely hirsute, adaxially glabrous or sparsely hispidulous, base cuneate or attenuate, margin crenate, apex obtuse or rounded. Flowers terminal or axillary, long pedicellate. Calyx tube adnate to ovary up to top, semiglobose, 10-ribbed, glabrous or sparsely scaberulose; lobes ovate or ovate-triangular, 8-12 × 4-6 mm, glabrous, margins entire or sparsely serrulate, apex acute or obtuse. Corolla yellowish green with red-purple veins, or red-purple with yellowish green spots, broadly campanulate, 2.2-3(-4) × 2.4-3(-4) cm, both sides glabrous; lobes deltoid, ca. 1/2 as long as tube, often sparsely villous at apex. Stamens glabrous; filaments slightly dilated at base, ca. 7 mm; anthers ca. 5 mm. Capsules semiglobose below, conical above, ca. 10 × 8 mm. Seeds numerous, brown-yellow, ovoid, wingless. Fl. and fr. Jul-Oct.
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