Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"25781 - Toxicodendron radicans (Linnaeus) Kuntze var. rydbergii (Small ex Rydb.) Erskine, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-85659. Accessed 08 May. 2025.