Stems often densely hirsute. Leaf blades: abaxial surface often densely hirsute. Flowering Jun-Aug. Margins of ponds and streams, lake shores, gravelly beaches, roadside ditches, mud flats, wet meadows, stream banks, springy ledges, swamps; Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., Ont., Que., Sask., Yukon; Alaska, Calif., Colo., Conn., Del., Idaho, Ind., Iowa, Maine, Mass., Mich., Minn., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., Utah, Vt., Wash., Wis., Wyo.