Cirsium is a genus of perennial and biennial flowering plants in the Asteraceae, one of several genera known commonly as thistles. (wikipedia.org)
Vulgare5
Extensions from the leaf base down the stem, called wings, can be lacking (Cirsium arvense), conspicuous (Cirsium vulgare), or inconspicuous. (wikipedia.org)
Cirsium vulgare (bull thistle, common thistle, or spear thistle) is listed as a noxious weed in nine US states. (wikipedia.org)
Cirsium vulgare, for instance, ranked in the top 10 for nectar production in a UK plants survey conducted by the AgriLand project which is supported by the UK Insect Pollinators Initiative. (wikipedia.org)
Cirsium vulgare was also a top producer of nectar sugar in another study in Britain, ranked third with a production per floral unit of (2323 ± 418μg). (wikipedia.org)
Certain species of Cirsium, like Cirsium monspessulanum, Cirsium pyrenaicum and Cirsium vulgare, have been traditionally used as food in rural areas of southern Europe. (wikipedia.org)
Scariosum4
Cirsium undulatum is known to hybridize with C. flodmanii, C. hookerianum , and C. scariosum var. (swbiodiversity.org)
Cirsium scariosum is a widely distributed complex of intergrading races distributed from southwestern Canada to 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)
Carduus2
These differ from other thistle genera (Carduus, Silybum and Onopordum) in having feathered hairs to their achenes. (wikipedia.org)
Cnicus ochrocentrus, Carduus undulatus var. (asu.edu)
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)
Widely2
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)
The name Cirsium utahense has been widely applied in the past to plants that are here recognized as C. inamoenum . (intermountainbiota.org)
Oblong1
blades oblong to lanceolate and sinuate-pinnatifid, the margins toothed or entire, with spines 2-6 mm long, the blade undersides white-tomentose, upper surfaces floccose-tomentose but still green. (swbiodiversity.org)
Desert thistle is widespread in the Mojave and Sonoran deserts and ranges into the southern Great Basin desert, western Chihuahuan desert, and into adjacent mountains of Utah, southwestern Colorado, Arizona, and New Mexico. (intermountainbiota.org)
Species3
Cirsium thistles are used as food plants by the larvae of some Lepidoptera species-see list of Lepidoptera that feed on Cirsium. (wikipedia.org)
Some prairie and wildflower seed production companies supply bulk seed for native North American thistle species, for wildlife habitat restoration, although availability tends to be low. (wikipedia.org)
Greek1
Cirsium is Greek for thistle, while ochrocentrum means having and ochre-colored center. (asu.edu)
Cirsium barnebyi occurs from the southern Rocky Mountains of southwestern Wyoming, northeastern Utah, and northwestern Colorado. (asu.edu)
Arvense7
Extensions from the leaf base down the stem, called wings, can be lacking (Cirsium arvense), conspicuous (Cirsium vulgare), or inconspicuous. (wikipedia.org)
They can spread by seed, and also by rhizomes below the surface (Cirsium arvense). (wikipedia.org)
Desert thistle is widespread in the Mojave and Sonoran deserts and ranges into the southern Great Basin desert, western Chihuahuan desert, and into adjacent mountains of Utah, southwestern Colorado, Arizona, and New Mexico. (swbiodiversity.org)
Desert1
The desert thistle is closely related to C. occidentale . (swbiodiversity.org)