Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"80859 - Petasites frigidus (L.) Fries var. palmatus (Aiton) Cronquist, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-164607. Accessed 12 Dec. 2024.