Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"135783 - Populus deltoides W. Bartram ex Marshall var. occidentalis Rydberg, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-158766. Accessed 20 Apr. 2025.