Compositae Working Group (CWG) (2021). Global Compositae Database. Cirsium butleri (Rydb.) Petr.. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1175094 on 2025-03-28
Contributed data: Authors Data only shown for fields conflicting with the consensus taxon record (Rydb.) Petrak [Preliminary Checklist of North American Compositae] Petr. [IPNI] [details] Contributed data: Basionym Data only shown for fields conflicting with the consensus taxon record Carduus butleri [Govaerts World Compositae Checklist A-G] [details] Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Cirsium butleri (Rydb.) Petrak [Preliminary Checklist of North American Compositae] Cirsium butleri Petr. [IPNI] [details] Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Beih. Bot. Centralbl. 35(2) [Govaerts World Compositae Checklist A-G] Beihefte zum Botanischen Centralblatt 35(2[2/3]): [Tropicos] [details] LSID urn:lsid:compositae.org:names:5E375C2B-ACAB-419F-A9AD-33BEB54ACD23 [details]