Distribution
Albania, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Canada (introduced), Czech Republic, Denmark, Estonia, Finland, France, Georgia, Germany, Greece, Hungary, Italy, Kosovo, Latvia, Liechtenstein, Lithuania, Luxembourg, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine, United Kingdom of Great Britain and Northern Ireland, United States of America (introduced)

Native to: Afghanistan, Albania, Algeria, Austria, Baltic States, Belarus, Belgium, Bulgaria, 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, Krym, Lebanon-Syria, Morocco, Myanmar, Nepal, Netherlands, North Caucasus, North European Russi, Northwest European R, Norway, Pakistan, Palestine, Poland, Portugal, Romania, Sicilia, South European Russi, Spain, Sweden, Switzerland, Tadzhikistan, Tibet, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Uzbekistan, West Himalaya, Xinjiang, Yugoslavia.
Introduced into: Alabama, Argentina South, British Columbia, Colorado, Connecticut, Delaware, District of Columbia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Korea, Maine, Maryland, Masachusettes, Michigan, Missouri, Montana, Nebraska, New Hampshire, New Jersey, New York, New Zealand South, North Carolina, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Primorye, Rhode I., South Dakota, Tennessee, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming.

Stems simple or branched distally, (1.5-)3-9(-13) dm; glabrous or pilose basally, trichomes to 1.5 mm. Basal leaves: petiole 3-16(-22) cm; blade reniform or cordate, (6-)15-88(-118) mm wide (shorter in length), surfaces glabrous or pilose. Cauline leaves: petiole shorter than basal; blade ovate, cordate, or deltate, to 15 × 15 cm, base cordate or truncate, margins acutely to obtusely toothed, apex acute. Racemes several-flowered. Fruiting pedicels terete, (2-)3-10(-15) mm. Flowers: sepals (2-)2.5-3.5(-4.5) × 0.7-1.5 mm; petals (2.5-)4-8(-9) × (1.5-)2-3(-3.5) mm, base attenuate to clawlike; filaments 2-3.5(-4.5) mm; anthers oblong, 0.7-1 mm. Fruits divaricate-ascending, subtorulose, quadrangular or subterete, (2-)3-7(-8) cm × 1.2-2.5 mm; style (0.2-)1-2(-3) mm. Seeds dark brown or black, narrowly oblong, 2-4.5 × 0.7-2 mm. 2n = 42.
Phenology: Flowering Apr-May.
Habitat: Roadsides, trails, railroad tracks, stream banks, waste places, fields, shaded woodlands, bluffs, thickets, steep slopes, disturbed fields, floodplains, woods, shaded forest floor.
Elevation: 0-1200 m.
(Flora of North America)