Compositae Working Group (CWG) (2021). Global Compositae Database. Cirsium butleri (Rydb.) Rydb.. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1173182 on 2025-03-26
Contributed data: Authors Data only shown for fields conflicting with the consensus taxon record Rydb. [IPNI] [details] Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Cirsium butleri Rydb. [IPNI] [details] Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Flora of the Rocky Mountains [Tropicos] [details] LSID urn:lsid:compositae.org:names:68D698CE-30D1-4A3F-8F34-29A65B172F69 [details] Taxonomy as "Butleri" -- isonym [details]