Compositae Working Group (CWG) (2025). Global Compositae Database. Cirsium occidentale var. compactum Hoover. Accessed at: https://www.compositae.org/gcd/aphia.php?p=taxdetails&id=1157145 on 2025-09-13
original description(1970). Vasc. Pl. San Luis Obispo Co., Calif. page(s): 310 [details]
Present Inaccurate Introduced: alien Containing type locality
Unreviewed
Contributed data: Full Name Data only shown for fields conflicting with the consensus taxon record Cirsium occidentale (Nutt.) Jeps. var. compactum Hoover [IPNI] Cirsium occidentale (Nutt.) Jeps. var. compactum Hoover [Preliminary Checklist of North American Compositae] [details] Contributed data: Published Data only shown for fields conflicting with the consensus taxon record The Vascular Plants of San Luis Obispo County, California [Tropicos] [details] LSID urn:lsid:compositae.org:names:7CA8EF05-6E35-47DF-A603-760BAEAB0CF6 [details] Taxonomy as "compacta" [details] Type material 13 June 1964, 9087, R. F. Hoover, Point Sierra Nevada, N of Arroyo de la Guz, isotype UC? [details]