Difference between revisions of "Cirsium eatonii"

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{{Plant2000
 
{{Plant2000
|array architecture=racemiform,spiciform
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|apex architecture_or_shape=spiny
|array height_or_length=short
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|apex orientation=ascending,spreading
|array orientation=erect
+
|apex position=outer
|corolla coloration=purple
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|apex shape=linear-acicular,entire,plane,spine-tipped
|face external_texture=glabrous,glabrous
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|array architecture=subcapitate,spiciform,racemiform,branched
|head architecture=short-pedunculate,branched
+
|base orientation=short-appressed
|involucre external_texture=arachnoid-tomentose,glabrate
+
|blade shape=oblong
|involucre prominence=evident
+
|bract shape=spiny-fringed
|phyllary coloration=purple
+
|branch orientation=ascending
|phyllary position=outer
+
|caudex architecture=taprooted
|spine fragility=stout
+
|collar coloration=stramineous
|spine size=slender
+
|collar variability=differentiated
|stem orientation=ascending,erect
+
|corolla coloration=ochroleucous,yellow,lavender,pink,purple
|stem size=slender
+
|cypsela coloration=brown
|Flowering time=summer,jun,jul,aug,sep,fall
+
|face architecture=winged-petiolate,sessile
 +
|face arrangement=distributed
 +
|face count=present,many
 +
|face external_texture=glabrous,villous,glabrous,villous
 +
|face other=principal
 +
|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
 +
|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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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.
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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.

Revision as of 21:15, 14 November 2013


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.