Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"109968 - Urtica dioica L. var. lyallii (S. Wats.) C. L. Hitchc., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-81812. Accessed 10 Apr. 2025.