Coefficient of Conservatism:
Coefficient of Wetness:
A native of the northwestern United States, but spreading eastward as a weed into disturbed places, roadsides, railroads, agricultural land and gardens; shores, and rocky ground, often in moist sites. Early established in Michigan. Collected in 1860 in Washtenaw Co., and also in the 1860’s in Berrien and Wayne Cos.; said by C. K. Dodge in 1896 to be “becoming common” at Port Huron, St. Clair Co.