Annual, up to 60 cm.. Leaves oblong in outline, pinnatifid or lobate. Inflorescence leafy at lower part. Perianth segments 5, united at base, opened in the fruit, their dorsal part covered with glandular and scattered simple hairs. Fruit 0.6-0.8 in diam. Pericarp very thin, with tiny papillae. Seeds blackish or reddish-black, with small keel at margin, with whitish longitudinal stripes; embryo horizontal. Fl. June-August.