Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"109807 - Equisetum hyemale L. ssp. affine (Engelm.) Calder & Roy L. Taylor, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-12975. Accessed 26 Jan. 2025.