*Althaea rosea L. HOLLYHOCK. "Introduced. Clifton, Ontario. Escaped from cultivation," Day (1888). Ontario, Queen Victoria Park, Panton (1890). Ontario: " Niagara Falls, Wm. Scott, Sept. 13, 1902 (TRT), Heimburger (1955). "... well established at several localities along the River," Hamilton (1943).

Reported as rare in the Niagara Frontier Region by Zander and Pierce (1979).