Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"72755 - Clematis columbiana (Nutt.) Torr. & A. Gray var. columbiana, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-106895. Accessed 26 Mar. 2025.