"Species Details - Carduus nutans L. ssp. leiophyllus (Petrovič) Stoj. & Stef., University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/1-23163/12-150742. Accessed 25 Dec. 2024.
There are 4 specimens of this Species.