Biennial, 40-200 cm, stems stout, erect, branched from base, glabrous, sparsely hirsute at base. Leaves shortly hirsute on both sides; basal short-stalked, oblong in outline, runcinate-pinnatipartite, 15-20 cm long, 4-5 cm wide, sinuate and irregularly dentate; median oblong, sessile, lobes irregularly triangular-lanceolate. Inflorescence paniculate-racemose, spike-like on lateral branches. Flowers white, axillary and terminally arranged. Calyx lobes 5-10 mm, triangular-lanceolate, shortly hirsute on margin and middle nerves, with short reflexed appendages, c. 1-3 mm. Corolla 18-20 mm, campanulate, divided to 1/3; lobes lanceolate, erectopatent to reflexed, scabrid outside on middle nerves. Style to 15 mm, hairy for 3/4 of its length. Capsule obconic, 8-10-ribbed, dehiscing by 8-10 valves at base. Seeds numerous, small, 0.8-1 × 0.3-0.4 mm, ellipsoid, light brown, shiny.