Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"49823 - Petasites albus (L.) Gaertn. × Petasites paradoxus (Retz.) Baumg., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-164370. Accessed 12 Mar. 2025.