Butterburs and Coltsfoots West of the Cascade Mountains of Oregon and Washington

The Genus Petasites

Fragrant Coltsfoot, Winter Heliotrope: Petasites fragrans - Not naturalized.

Alpine Butterbur, Arctic Butterbur, Alpine Coltsfoot, Arctic Sweet Coltsfoot, Arrowleaf Sweet Coltsfoot, Frigid Coltsfoot, Sweet Coltsfoot: Petasites frigidus var frigidus (Synonym: Petasites frigidus var. nivalis) -

Alpine Butterbur, Arctic Butterbur, Sweet Coltsfoot, Western Coltsfoot: Petasites frigidus var. palmatus (Synonyms: Nardosmia palmata, Petasites arcticus, Petasites frigidus ssp. arcticus, Petasites palmatus, Petasites palmatus ssp. speciosus, Petasites speciosus, Tussilago palmata) -

Japanese Coltsfoot, Japanese Sweet Coltsfoot: Petasites japonicus (Synonyms: Petasites japonicus var. giganteus, Petasites japonicus var. japonicus) -