• C. acaulescens , C . congdonii, C. coloradense , and C. scariosum in the restricted sense. (swbiodiversity.org)
  • Cirsium coahuilense Ownbey & Pinkava Cirsium coloradense (Rydb. (wikipedia.org)
  • However, most reports of Cirsium undulatum in California are based upon misidentifications of C. canescens . (swbiodiversity.org)
  • Cirsium scariosum is a widely distributed complex of intergrading races distributed from southwestern Canada to northwestern Mexico. (swbiodiversity.org)
  • 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)
  • S. L. Welsh (1982) proposed C. scariosum var. (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)
  • 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)
  • The following species in the flowering plant genus Cirsium, the plume thistles, are accepted by Plants of the World Online. (wikipedia.org)
  • A 2022 molecular study reassigned many species to other genera, but Cirsium remains a speciose genus. (wikipedia.org)