Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"3233 - Carex douglasii Boott, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search-test.museums.ualberta.ca/12-92496. Accessed 30 Oct. 2025.