Difference between revisions of "Cirsium scariosum"

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{{Plant2000
 
{{Plant2000
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|apex shape=entire,serrate
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|apex size=expanded
 
|appendage external texture=scarious
 
|appendage external texture=scarious
|appendage position=inner
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|appendage shape=erose-toothed
|appendage shape=acuminate,entire,erose-toothed
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|array architecture=spiciform,racemiform
|appendage size=expanded
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|blade shape=oblanceolate,elliptic,lobed
|blade shape=linear,oblong,oblanceolate,elliptic,lobed,unlobed
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|chromosome count=34,36
 
|chromosome count=34,36
 
|corolla coloration=white,purple
 
|corolla coloration=white,purple
|head architecture=sessile,short-pedunculate
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|face coloration=green,throughout,or,unpigmented
|head arrangement or habit=clustered
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|face external texture=glabrous,gray-tomentose,glabrous
|leaf arrangement=crowded
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|face internal texture=firm
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|face position=adaxial,distal
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|face width=narrow
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|head architecture=sessile,pedunculate
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|leaf architecture or shape=bractlike
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|leaf size=reduced
 
|phyllary position=outer
 
|phyllary position=outer
 
|phyllary shape=mid,ovate
 
|phyllary shape=mid,ovate
|spine coloration=pink,or,purplish
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|spine fragility=stout
|spine count=numerous
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|spine height or length=shorter
|spine fragility=weak
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|spine length=longer
|spine position=distal
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|spine size=1
|spine size=larger,1
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|stem architecture=simple,unbranched,leafy
|spine width=narrow,thin
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|stem external texture=villous,glabrate
|stem architecture=simple,leafy
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|stem external texture=glabrous,villous,tomentose
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|trichome architecture=septate
 
|trichome architecture=septate
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|trichome external texture=arachnoid,tomentose
 
|whole organism architecture=caulescent,acaulescent
 
|whole organism architecture=caulescent,acaulescent
 
|whole organism life style=plant
 
|whole organism life style=plant
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|flowering time=summer,jun,jul,aug,sep,fall
 
|flowering time=summer,jun,jul,aug,sep,fall
 
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The presence of Cirsium scariosum on the islands of the Mingan Archipelago in Quebec, some 3200 km east of the Rocky Mountains populations, has led to alternative hypotheses regarding the disjunction. Frère Marie-Victorin (1925) hypothesized that the disjunct distribution of C. minganense from what he called C. foliosum (Hooker) Candolle was a result of migration during deglaciation (18,000 to ca. 8000 BP) from a glacial refugium in western North America to eastern Canada in the barren habitats along the receding ice front. Later (1938) he presented a second hypothesis that Pleistocene glacial events had divided a preglacial range into vicariant populations that survived in separate refugia in western and eastern regions. R. J. Moore and C. Frankton (1967) argued that the disjunction is modern, resulting from a chance introduction of C. scariosum from western North America to Quebec in the early twentieth century. They reached this conclusion because early collectors that had visited the Mingan Archipelago had failed to collect this conspicuous thistle.
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Variety coloradense is common in the mountains of southern and central Colorado with outlying populations in northern New Mexico, northeastern Arizona, central Utah, and southeastern Wyoming. In Colorado it is largely allopatric with the usually acaulescent var. americanum. Some plants from the White Mountains and San Francisco Peaks of Arizona and from Gunnison County, Colorado, approach var. thorneae in having deeply divided, extremely spiny distal leaves that overtop the heads. Putative hybrids between var. coloradense and Cirsium grahamii have been documented in Apache County, Arizona, and between var. coloradense and C. undulatum in Las Animas County, Colorado.

Revision as of 19:15, 28 November 2013


Variety coloradense is common in the mountains of southern and central Colorado with outlying populations in northern New Mexico, northeastern Arizona, central Utah, and southeastern Wyoming. In Colorado it is largely allopatric with the usually acaulescent var. americanum. Some plants from the White Mountains and San Francisco Peaks of Arizona and from Gunnison County, Colorado, approach var. thorneae in having deeply divided, extremely spiny distal leaves that overtop the heads. Putative hybrids between var. coloradense and Cirsium grahamii have been documented in Apache County, Arizona, and between var. coloradense and C. undulatum in Las Animas County, Colorado.