However, most reports of Cirsium undulatum in California are based upon misidentifications of C. canescens . (swbiodiversity.org)
Flodmanii5
Cirsium undulatum is known to hybridize with C. flodmanii, C. hookerianum , and C. scariosum var. (swbiodiversity.org)
I find the key answers separating C. undulatum from C. flodmanii to be contradictory and not always correct. (colinherb.com)
The achene of C. flodmanii is brown and has a well-defined yellow apical band about 0.5 mm wide, while the achene of C. undulatum is more straw coloured and does not have a well-defined apical band. (colinherb.com)
Also included are just those answers from the species key in Flora of the Great Plains (FGP) which separate C. undulatum from C. flodmanii . (colinherb.com)
All the answers which separate C. undulatum from C. flodmanii are written on a white background. (colinherb.com)
Widely distributed2
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)
Cirsium scariosum is a widely distributed complex of intergrading races distributed from southwestern Canada to northwestern Mexico. (swbiodiversity.org)
Flora2
Answers to key questions in Budd's Flora (BF) and Flora of Alberta (FOA) leading to this species. (colinherb.com)
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)
Subspecies1
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)
Races1
A detailed study of this species might reveal races worthy of recognition as infraspecific taxa. (swbiodiversity.org)
Concern1
Some of these species are exotics (not native to Montana) and some species have been designated as Species of Concern. (wikipedia.org)
White1
The usual species are along the Upper Crossing Trail, notably White and Purple Prairie-clover, Scurf Pea, and James' Buckwheat. (inaturalist.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)
Utah1
thorneae from Utah and lumped the various species recognized by Moore and Frankton within a highly polymorphic var. (swbiodiversity.org)
Special1
The Idaho Fish and Wildlife Information System tracks species that are identified as having special conservation status in the following lists. (idaho.gov)
Thistle1
Cirsium undulatum (Wavyleaf Thistle) is a species of biennial herb in the family Asteraceae . (eol.org)