Compositae Working Group (CWG) (2021). Global Compositae Database. Carduus americanus var. perplexans (Rydb.) A.Nelson. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1235743 on 2025-03-24
Contributed data: Authors Data only shown for fields conflicting with the consensus taxon record A.Nelson [IPNI] [details] Contributed data: Basionym Data only shown for fields conflicting with the consensus taxon record Carduus perplexans [Govaerts World Compositae Checklist A-G] [details] Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Carduus americanus var. perplexans A.Nelson [IPNI] [details] Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Man. Bot. Rocky Mt. , ed. 2 [Govaerts World Compositae Checklist A-G] [details] LSID urn:lsid:compositae.org:names:96993167-8C02-4AED-9354-C253C81A59AA [details]