Cirsium undulatum is widely distributed in the wstern half of North America from the dry plains and plateaus of the Pacific Northwest eastward across the Great Plains to Manitoba and the Dakotas and south to Texas, New Mexico, and northwestern Mexico. (swbiodiversity.org)
After consulting with A. Cronquist and studying his manuscript treatment of Cirsium for the Intermountain Flora , D. J. Keil and C. E. Turner (1993) also accepted a broadly construed C. scariosum . (swbiodiversity.org)
Americanum1
americanum and C. canescens and between C. scariosum var. (asu.edu)
However, there is a minor 'scarp' east of Perth, called the Darling Range ( https://en.wikipedia.org/wiki/Darling_Scarp ), in association with which some of the slopes are steep enough for the lateritic profile to have been partly eroded ( https://www.foxeslair.org/why-are-wa-plants-and-soils-unique.html ). (inaturalist.org)
Perennial1
Cirsium scopularium ssp coloradoense appears here and there with white flowers on a plant that probably is a biennial or short lived perennial. (blogspot.com)
Species5
Cirsium scariosum is a variable species growing in a variety of habitat types. (wikipedia.org)
F. Petrak (1917) recognized ten species plus several subspecies for the taxa I am treating here as C. scariosum (in the broad sense). (swbiodiversity.org)
The latter two species, while clearly related to C. scariosum , have a range restricted mostly to Canada. (swbiodiversity.org)
Cronquist (1994) treated C. scariosum as an extremely variable species that included the four species recognized by Moore and Frankton plus the variety proposed by Welsh. (swbiodiversity.org)
The plant ( Cirsium verutum ) is differentiated from related species C. wallichii by its usually purplish flowers (though white ones should also be expected if we follow FBI and Collett), outer as well as inner involucre bracts ending in spines longer than 5 mm. (google.com)
Widely distributed1
Cirsium scariosum is a widely distributed complex of intergrading races distributed from southwestern Canada to northwestern Mexico. (swbiodiversity.org)
Plant1
Cirsium scariosum looks like Medusa was turned into a plant. (creekycedars.com)
Images by Gurcharan Singh , Aarti S Khale (Id by Gurcharan Singh) , Chitra Shanker & N Arun (Both Ids by Gurcharan Singh) (Inserted by J.M.Garg) (For more photos & complete details, click on the links))- Similar to Cirsium verutum but having yellow to white heads, and inner involucre bracts with dilated tips. (google.com)
Colorado1
In the mountains of Colorado putative hybrids have been documented between Cirsium scariosum var. (asu.edu)
The name of Cirsium foliosum was misapplied to many plants in the western U.S. (Keil in Flora of North America 2006). (mt.gov)
Plant1
Cirsium scariosum looks like Medusa was turned into a plant. (creekycedars.com)
Flora1
Cirsium foliosum was included in the Flora of Montana (Booth 1966) which was the basis for its report in the Vascular Plants of Montana (Dorn 1984). (mt.gov)
Montana1
Cirsium foliosum is not documented in Montana (MTNHP Status Review in 2017). (mt.gov)