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Family: Asteraceae
  Genus: Petasites

    Petasites frigidus (L.) Fr.
        Arctic sweet-colt's-foot, northern sweet-colt's-foot
    Petasites frigidus (L.) Fr. var. palmatus (Aiton) Cronquist*+

        Arctic sweet-colt's-foot, northern sweet-colt's-foot
             Nardosmia arctica (Porsild) A.Löve & D.Löve
             Petasites frigidus (L.) Fr. subsp. palmatus
             Petasites arcticus Porsild
             Petasites frigidus (L.) Fr. subsp. arcticus
             Petasites hookerianus (Nutt.) Rydb.
             Petasites palmatus (Aiton) A.Gray
             Petasites speciosus (Nutt.) Piper
             Tussilago palmata Aiton
    Petasites sagittatus (Banks ex Pursh) A.Gray*+

        arrowhead sweet-colt's-foot, arrow-leaf sweet-colt's-foot
             Petasites dentatus Blank.
             Tussilago sagittata Banks ex Pursh
    Petasites X vitifolius Greene (pro sp.) X *+

        sweet-colt's-foot
             Nardosmia vitifolia (Greene) A.Löve & D.Löve
             Petasites nivalis Greene subsp. vitifolius
             Petasites trigonophylla Greene
             Petasites warrenii H.St.John

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