"Species Details - Arnica angustifolia Vahl ssp. tomentosa (J. M. Macoun) G. W. Douglas & Ruyle-Douglas, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-8606/12-141216. Accessed 13 Dec. 2024.
There are 59 specimens of this Species.