"Species Details - 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/g/1-25092/12-164957. Accessed 06 Jul. 2024.
There is 1 specimen of this Species.