Cirsium undulatum

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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. It occurs in scattered localities in the Rocky Mountains and northeastern Great Basin region. At least some of the few widely scattered records from the eastern United States are probably introductions. Cirsium undulatum is both widespread and variable. Plants of the Great Plains region tend to be low-growing with a few large heads and elongate corollas. Plants of the Pacific Northwest are usually taller and produce smaller, more numerous heads with shorter corollas. A detailed study of this species might reveal races worthy of recognition as infraspecific taxa.

Facts about "Cirsium undulatum"
apex architecture or shapespineless + and spiny +
apex courseflexuous +
apex prominence or shapeflat +
apex shapeentire +
array architectureleafy + and corymbiform +
base architectureauriculate-clasping +
blade shapeelliptic +, oblong + and ovate +
body colorationconcolorous +
body widthnarrow +
bud derivationadventitious +
chromosome count26 +
corolla colorationlavender +, pink +, purple + and white +
cypsela colorationlight + and brown +
division characterentire-margined +
division shapelanceolate +, triangular + and spine-tipped +
face architecturespinier +
face countpresent +
face external texturetomentose +
face orientationappressed +
face otherprincipal +
face positionbasal +, cauline +, distal +, outer + and middle +
face shapeshort-decurrent +
face sizereduced +
flowering timespringmay +, jun +, jul +, aug +, sep + and oct +
habitatmixedgrass prairie +, shortgrass prairie palouse prairie +, sagebrush deserts +, pinyon-juniper woodlands +, openings in montane coniferous forests + and in disturbed areas +
habitat moisturedry +
head positionterminal +
involucre external texturearachnoid + and glabrate +
involucre shapeovoid +, hemispheric + and campanulate +
lobe architecture or shapespinulose +
lobe arrangementseparated + and spaced +
lobe orientationascending + and spreading +
lobe shapetriangular +, dentate + and cleft +
margin shapeundulate +, dentate + and lobed +
pappus reliefscabridulous +
phyllary arrangementimbricate +
phyllary shapeovate +, lanceolate + and linear-lanceolate +
ridge prominenceprominent +
root locationseated +
spine colorationyellowish +
spine external texturegray-tomentose +
spine orientationspreading +
spine positionabaxial +
stem external texturegray-tomentose +
stem orientationerect + and ascending +
whole organism life styleperennial +