Petasites albus - Wikipedia
Winter Heliotrope: Petasites fragrans – The Frustrated Gardener
Petasites japonicus — Bevin Clare
Petasites hybridus - Wikidata
Petasites japonicus (Siebold & Zucc.) Maxim. | Plants of the World Online | Kew Science
Petasites frigidus
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A Tale of Two Petasites - WNPS Blog - Botanical Rambles
Petasites japonicus: (Fuki)ng awesome! – UVic Permaculture
Petasites japonicus, with Gigantic Leaves
Washington State Noxious Weed Control Board
Petasites hybridus, Butterbur: identification, distribution, habitat
Petasites - Wikipedia
Petasites japonicus Butterbur – Earthly Pursuits, Inc.
Petasites japonicus - Wikipedia
Petasites japonicus (Japanese sweet-coltsfoot): Go Botany
Butterbur (Petasites hybridus) Flower, Leaf, Care, Uses - PictureThis
Butterbur : Petasites hybridus - Asteraceae (Aster)
Petasites japonicus: Tips for Growing and Caring for Butterburs
The giant butterbur, Petasites japonicus – Botanics Stories
Petasites japonicus (giganteus) - Zone 6 Plants - Forestfarm.com
Petasites hybridus (L.) G.Gaertn., B.Mey. & Scherb. | Plants of the World Online | Kew Science
Garden Talk | Duke Gardens
Petasites hybridus | UMass Amherst Landscape, Nursery & Urban Forestry Program
Petasites hybridus | landscape architect's pages
