Compositae Working Group (CWG) (2025). Global Compositae Database. Cirsium horridulum f. atropurpureum Moldenke. Accessed at: https://www.compositae.org/gcd/aphia.php?p=taxdetails&id=1164637 on 2025-09-15
Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Cirsium horridulum Michx. f. atropurpureum Moldenke [IPNI] [details] LSID urn:lsid:compositae.org:names:363E6175-DFFB-4531-B1D2-23B23279D6DE [details] Type material 26857, H.N.Moldenke, A.L.Moldenke, holotype LL [details]