Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"19193 - Polygonum douglasii Greene ssp. spergulariiforme (Meisner ex Small) J. C. Hickman, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-135586. Accessed 27 Apr. 2025.