Difference between revisions of "Cirsium eatonii"

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{{Plant2000
 
{{Plant2000
|array architecture=spiciform,racemiform
+
|apex architecture or shape=spiny
|array orientation=erect
+
|apex orientation=ascending;spreading
|chromosome count=34
+
|apex position=outer
|corolla coloration=pink,purple
+
|apex shape=linear-acicular;entire;plane;spine-tipped
|face external texture=glabrous,or,villous
+
|array architecture=subcapitate;spiciform;racemiform;branched
|face position=abaxial
+
|base orientation=short-appressed
|head architecture=subsessile,short-pedunculate,branched
+
|blade shape=oblong
 +
|bract shape=spiny-fringed
 +
|branch orientation=ascending
 +
|caudex architecture=taprooted
 +
|collar coloration=stramineous
 +
|collar variability=differentiated
 +
|corolla coloration=ochroleucous;yellow;lavender;pink;purple
 +
|cypsela coloration=brown
 +
|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 arrangement=crowded
|involucre external texture=villous,arachnoid
+
|head orientation=erect;nodding
|phyllary coloration=green
+
|involucre coloration=green;suffused with dark-c-purple;purple
|phyllary position=outer
+
|involucre external texture=villous;tomentose
|spine count=few
+
|involucre shape=ovoid;campanulate
|spine fragility=stout
+
|involucre width=wider
|stem fragility=stout
+
|lobe arrangement=spaced;spaced
|stem orientation=erect,ascending
+
|lobe arrangement or shape=linear
|trichome architecture=septate,septate,non-septate
+
|margin arrangement=overlapping
|flowering time=summer,jun,jul,aug
+
|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
 
}}
 
}}
Variety peckii occurs from Steens Mountain and the Pueblo Mountains of Harney County, Oregon, south to the Black Rock Range and Jackson Mountains of Humboldt County, Nevada. On the lower portion of its distribution along Steens Mountain Loop Road at an elevation of about 1900 m, var. peckii and Cirsium inamoenum grow together and freely hybridize, forming a complex hybrid swarm. Intermediates variably combine the features of the parent taxa, with the habit more openly branched than typical for C. eatonii var. peckii, variably arachnoid tomentose leaves, ± glandular phyllaries, and lavender to pale pink flowers. Variety peckii may range as far south as the West Humboldt Mountains. The type of Cirsium humboldtense Rydberg (Carduus nevadensis Greene) closely resembles some of the hybrids between C. inamoenum and C. eatonii var. peckii.
+
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.

Latest revision as of 22:56, 18 February 2014


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.

Facts about "Cirsium eatonii"
apex architecture or shapespiny +
apex orientationascending + and spreading +
apex positionouter +
apex shapelinear-acicular +, entire +, plane + and spine-tipped +
array architecturesubcapitate +, spiciform +, racemiform + and branched +
base orientationshort-appressed +
blade shapeoblong +
bract shapespiny-fringed +
branch orientationascending +
caudex architecturetaprooted +
collar colorationstramineous +
collar variabilitydifferentiated +
corolla colorationochroleucous +, yellow +, lavender +, pink + and purple +
cypsela colorationbrown +
face architecturewinged-petiolate + and sessile +
face arrangementdistributed +
face countpresent + and many +
face external textureglabrous + and villous +
face otherprincipal +
face positionadaxial +, basal +, cauline + and distal +
face sizereduced +
head architecturesessile + and short-pedunculate +
head arrangementcrowded +
head orientationerect + and nodding +
involucre colorationgreen +, suffused with dark-c-purple + and purple +
involucre external texturevillous + and tomentose +
involucre shapeovoid + and campanulate +
involucre widthwider +
lobe arrangementspaced +
lobe arrangement or shapelinear +
margin arrangementoverlapping +
margin shapeundulate +, unlobed +, spiny-dentate +, pinnatifid +, lance-oblong +, triangular + and 3-lobed +
midvein external texturearachnoid-tomentose +
phyllary sizesubequal +
ridge widthnarrow +
stem architecturesimple + and branched +
stem external textureglabrous +, villous +, tomentose + and glabrate +
stem internal texturefleshy +
stem orientationerect + and ascending +
tip positionexserted +
tooth arrangementspaced +
trichome architectureseptate + and non-septate +
trichome external texturearachnoid-tomentose +
whole organism life styleperennial +