Distribution
Albania, Algeria, Austria, Belarus, Belgium, Bulgaria, Croatia, Denmark, Finland, France, Germany, Greece, Hungary, Iran, Italy, Morocco, Netherlands, Norway, Poland, Portugal, Romania, Russian Fedetation, Serbia, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom of Great Britain and Northern Ireland, United States of America (introduced)

Native to: Albania, Algeria, Austria, Azores, Baleares, Baltic States, Belarus, Belgium, Bulgaria, Canary Is., Central European Rus, Corse, Czechoslovakia, Denmark, East European Russia, Finland, France, Germany, Great Britain, Greece, Hungary, Iran, Italy, Krym, Madeira, Morocco, Netherlands, North Caucasus, North European Russi, Northwest European R, Norway, Poland, Portugal, Romania, Sardegna, South European Russi, Spain, Sweden, Switzerland, Transcaucasus, Turkey, Turkey-in-Europe, Ukraine, West Siberia, Yugoslavia.
Introduced into: Argentina Northeast, Argentina Northwest, Argentina South, Brazil South, British Columbia, Colorado, Connecticut, Delaware, Illinois, Indiana, Iowa, Ireland, Kentucky, Kirgizstan, Maine, Maryland, Masachusettes, Michigan, Minnesota, Missouri, Montana, New Brunswick, New Hampshire, New Jersey, New York, New Zealand North, New Zealand South, North Carolina, Nova Scotia, Ohio, Ontario, Pennsylvania, Peru, Prince Edward I., Québec, Rhode I., Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin.

Plants to 10 dm. Stems branching, ribbed. Leaves to 35 cm; petiole 2-10 cm; blade deeply 5-9-lobed; margins irregularly dentate or crenate, rarely laciniate. Inflorescences: peduncle 2-10 cm. Flowers: pedicels 5-35 mm; sepals to 1 cm; petals bright yellow, obovate to oblong, to 2 cm wide; style ca. 1 mm. Capsules linear to narrowly oblong, 2-5 cm, glabrous. Seeds black, reticulate-pitted.
Phenology: Flowering spring-summer.
Habitat: Moist to dry woods, thickets, fields, hedgerows and fences, roadsides, railroads, and waste ground.
Elevation: 0-1000 m.
(Flora of North America)