Compositae Working Group (CWG) (2021). Global Compositae Database. Carduus megacephalus A.Nelson. Accessed at: https://compositae.org/aphia.php?p=taxdetails&id=1201717 on 2024-05-18
original description(1909). New Man. Bot. Centr. Rocky Mt. page(s): 587 [details]
From other sources
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:0163F528-C182-4FC6-8CFC-BE9157C25E3C [details]