Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"73303 - Ratibida columnifera (Nutt.) Wooton & Standl. forma pulcherrima (DC.) Fernald, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-164957. Accessed 22 Mar. 2025.