Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"68963 - Ambrosia psilostachya DC. var. californica (Rydb.) S. F. Blake, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-125555. Accessed 11 Feb. 2025.