Distribution
Czech Republic, Poland, Ukraine, United States of America (introduced)

Native to: Albania, Algeria, Austria, Baleares, Baltic States, Belarus, Belgium, Bulgaria, Canary Is., Central European Rus, Corse, Cyprus, Czechoslovakia, Denmark, East Aegean Is., East European Russia, Finland, France, Germany, Great Britain, Greece, Hungary, Iran, Iraq, Ireland, Italy, Kazakhstan, Kirgizstan, Kriti, Krym, Lebanon-Syria, Libya, Madeira, Morocco, Netherlands, Northwest European R, Norway, Palestine, Poland, Portugal, Romania, Sardegna, Sicilia, South European Russi, Spain, Sweden, Switzerland, Tadzhikistan, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Uzbekistan, Yugoslavia.
Introduced into: Alabama, Arkansas, British Columbia, California, Cape Provinces, Connecticut, Delaware, District of Columbia, East Himalaya, Florida, Georgia, Illinois, Indiana, Kansas, Kentucky, Korea, Louisiana, Maryland, Michigan, Missouri, Nebraska, New Jersey, New York, North Carolina, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, South Carolina, South Dakota, Taiwan, Tennessee, Utah, Virginia, Washington, West Virginia.

Annuals. Stems decumbent to ascending, 5-40(-50) cm, eglandular-hairy. Leaves: blade suborbiculate, (3-)5-lobed, central lobe usually overtopping lateral ones, (5-)7-15(-20) × 8-16(-25) mm, base truncate, margins (3-)5-lobed, apex acute, surfaces sparsely eglandular-hairy. Racemes 1-10, terminal, 50-400(-500) mm, 5-20-flowered, axis eglandular-hairy; bracts suborbiculate, (3-)5-lobed, central lobe usually overtopping lateral ones, (5-)7-15(-20) mm. Pedicels patent or deflexed, (5-)9-15(-20) mm, equal to or ± shorter than subtending bract, length 2-3 times calyx, eglandular-hairy (in single line adaxially). Flowers: calyx lobes 5-6(-7) mm, apex acute, abaxial surface usually glabrous, ciliate with 25-35 hairs per side; corolla bright blue with bright white center, 5-7(-9) mm diam.; stamens sky blue, 0.7-1.2 mm; style (0.6-)0.7-0.9(-1.1) mm. Capsules ± round in cross section, ovoid, 3-4 × 4.5-6 mm, apex ± emarginate, glabrate. Seeds 1-4, bright yellow, ellipsoid to subglobular, urn-shaped, 2.3-3.3 × 2-3 mm, 1-2.2 mm thick, weakly cristate or rugose, ± smooth. 2n = 54 (Eurasia).
Phenology: Flowering (Feb-)Mar-Jun.
Habitat: Fields, lawns, gardens, ruderal places, vineyards, open forests, shady rocky places, dunes.
Elevation: 0-2000 m.
(Flora of North America)