Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"61683 - Rhamnus californica Eschsch. var. tomentella (Benth.) W. H. Brewer & S. Wats., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-86370. Accessed 23 Mar. 2025.