Roots carrot-shaped, up to 20 cm or longer. Stems erect, 60-100 cm tall, lower branches leafy, sterile, middle ones often absent, upper ones, if present, fertile but leafless. Leaves on main stems alternate, those on branches opposite, sessile or with petiole up to 1 cm; blade triangular, ovate, or lanceolate, 10-25 × 5-20 mm, glabrous or sparsely hispid, base shallowly cordate, rounded, or truncate, margin entire or crenate, revolute, apex acute. Flowers solitary, terminal on main stems, but upper branches often with 1 or 2 flowers. Calyx tube adnate to ovary up to middle, hemispheric, campanulate, or obconic, 10-ribbed; lobes distant from each other, narrowly triangular or lanceolate, 4-6 × 2-3 mm, margins entire or with denticles above, glabrous or very sparsely hispidulous at upper part. Corolla pale yellow-green, tubular-campanulate, 1.5-1.8 cm. Capsule ca. 1 cm in diam., obtuse or slightly cuneate at base. Seeds brown-yellow, ellipsoid, ca. 1.5 mm. Fl. Jun-Aug, fr. Sep.
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