Compositae Working Group (CWG) (2021). Global Compositae Database. Cirsium oreganum Piper. Accessed at: https://www.compositae.org/aphia.php?p=taxdetails&id=1167071 on 2025-03-15
original description(1919). Proc. Biol. Soc. Washington 32 page(s): 43 [details]
Unreviewed
Contributed data: Published Data only shown for fields conflicting with the consensus taxon record Proc. Biol. Soc. Wash. 32 [Govaerts World Compositae Checklist A-G] Proceedings of the Biological Society of Washington 32(12): [Tropicos] [details] LSID urn:lsid:compositae.org:names:E55D9753-D85B-4216-AC82-089D11272B65 [details]