Petasites palmatus subsp. speciosus (Nuttall) J. Toman

Petasites palmatus subsp. speciosus (Nuttall) J. Toman is a synonym sensu FNA Ed. Comm., 2006b of:

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