Single biennial plant height of 10-30 cm, with numerous lifts stems branching at the base. The leaves are rounded, crenate on the edge, the lower and average length of 10-20 mm and a width of 14-18 mm, with long petioles 1-2 (4) cm, bracts — rounded-reniform, sessile, half (hence the species name), incised 1/3 of the plate into oblong-ovate entire blade. Flowers numerous, collected on 6-10 in spaced whorls on the tips of stems and branches. Bracts about half as long as the calyx, lanceolate-subulate. Calyx campanulate, with oblique jaw, beloopushennaya with five elongated triangular ciliate teeth. Corolla purple or pink, 1.8-2 cm long, sometimes protruding from the cup due to underdevelopment, outside densely pubescent, with a thin, long tube, slightly curved, extended in the pharynx. Upper lip ovate, obtuse, the lower lip with dark spots, middle lobe of her back, heart-shaped, notched at the top and narrow at the base, the lateral lobes small, with one blunt tooth. The fruits are light gray or brown, almost triangular, with white warts on the surface. It flowers in May and September, the fruit ripens in June-October.
Widespread plant temperate Eurasia. In our country grows in the European part of the North Caucasus, Siberia, and the Far East. In Central Russia met in all areas.
It grows in fields, gardens, villages. Weed.