Coefficient of Conservatism:
Coefficient of Wetness:
Ranges from Labrador to Alaska, from the tundra south to the northern Great Lakes region. First collected in Michigan by D. Henson in 1981 in Schoolcraft Co. Wet, open ground; ditches, swales between pine ridges, sedge fens.
Apparently hybridizes with P. frigidus, producing intermediate plants that may be called P. ×vitifolius Greene. These are known from Alger, Chippewa, Ontonagon, and Schoolcraft Cos. Because of their rather different distributions, and clear distinctness in Michigan, we keep P. frigidus and P. sagittatus separate. Petasites sagittatus has been placed as a variety of P. frigidus, var. sagittatus (Pursh) Cherniawsky.