Petasites frigidus subsp. arcticus (A.E. Porsild) Cody

Petasites frigidus subsp. arcticus (A.E. Porsild) Cody is a synonym sensu FNA Ed. Comm., 2006b of:

Petasites frigidus var. palmatus (Aiton) Cronquist, an accepted variety name sensu FNA Ed. Comm., 2006b.