Difference between revisions of "Cirsium eatonii"

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{{Plant2000
 
{{Plant2000
|apex architecture_or_shape=spiny
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|array architecture=racemiform,spiciform
|apex orientation=ascending,spreading
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|array height_or_length=short
|apex position=outer
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|array orientation=erect
|apex shape=linear-acicular,entire,plane,spine-tipped
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|corolla coloration=purple
|array architecture=subcapitate,spiciform,racemiform,branched
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|face external_texture=glabrous,glabrous
|base orientation=short-appressed
+
|head architecture=short-pedunculate,branched
|blade shape=oblong
+
|involucre external_texture=arachnoid-tomentose,glabrate
|bract shape=spiny-fringed
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|involucre prominence=evident
|branch orientation=ascending
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|phyllary coloration=purple
|caudex architecture=taprooted
+
|phyllary position=outer
|collar coloration=stramineous
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|spine fragility=stout
|collar variability=differentiated
+
|spine size=slender
|corolla coloration=ochroleucous,yellow,lavender,pink,purple
+
|stem orientation=ascending,erect
|cypsela coloration=brown
+
|stem size=slender
|face architecture=winged-petiolate,sessile
+
|Flowering time=summer,jun,jul,aug,sep,fall
|face arrangement=distributed
+
|face count=present,many
+
|face external_texture=glabrous,villous,glabrous,villous
+
|face other=principal
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|face position=adaxial,basal,cauline,distal
+
|face size=reduced,reduced
+
|head architecture=sessile,short-pedunculate
+
|head arrangement=crowded
+
|head orientation=erect,nodding
+
|involucre coloration=green,suffused,with,dark-c-purple,purple
+
|involucre external_texture=villous,tomentose
+
|involucre shape=ovoid,campanulate
+
|involucre width=wider
+
|lobe arrangement=spaced,spaced
+
|lobe arrangement_or_shape=linear
+
|margin arrangement=overlapping
+
|margin shape=undulate,unlobed,spiny-dentate,pinnatifid,lance-oblong,triangular,3-lobed,spiny-dentate
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|midvein external_texture=arachnoid-tomentose
+
|phyllary size=subequal
+
|ridge width=narrow
+
|stem architecture=simple,branched,branched
+
|stem external_texture=glabrous,villous,tomentose,glabrate
+
|stem internal_texture=fleshy
+
|stem orientation=erect,ascending
+
|tip position=exserted
+
|tooth arrangement=spaced
+
|trichome architecture=septate,septate,septate,septate,non-septate
+
|trichome external_texture=arachnoid-tomentose
+
|whole_organism life_style=perennial
+
|Flowering time=mar,spring,apr,may,jun,summer,jul,aug,sep,fall,oct,nov
+
 
}}
 
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Cirsium eatonii is a polymorphic species widely distributed in a high elevation archipelago across the central Rocky Mountains and the Intermountain Region. During Pleistocene glacial episodes, the progenitors of this species complex undoubtedly occupied lower elevation sites and likely had more contiguous populations. Post-glacial isolation of these populations in allopatric high elevation sites has allowed them to differentiate to a greater or lesser extent. Prehistoric or recent introgressive hybridization with other thistle species probably has contributed to the diversification of the complex (R. J. Moore and C. Frankton 1965). Several of the races recognized here as varieties have been treated in the past as species (e.g., C. clokeyi, C. peckii). Their current geographic isolation and more or less distinctive features might support such recognition, but application of this approach across the complex would result in a proliferation of microspecies.
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Variety eatonii is distributed on various of the sky islands in the Basin and Range province of Nevada and Utah. Habitats vary from shaded forest understory sites to forest openings or open exposed sites.

Revision as of 20:58, 14 November 2013


Variety eatonii is distributed on various of the sky islands in the Basin and Range province of Nevada and Utah. Habitats vary from shaded forest understory sites to forest openings or open exposed sites.