Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"91468 - Arnica angustifolia Vahl ssp. attenuata (Greene) G. W. Douglas & Ruyle-Douglas, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-110300. Accessed 17 Mar. 2025.