Difference between revisions of "Cirsium inamoenum"

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{{Plant2000
 
{{Plant2000
|apex arrangement or shape=linear
 
|apex orientation=appressed,ascending,spreading
 
|apex position=outer,mid
 
|apex shape=spine-tipped,spineless
 
|array architecture=open,corymbiform
 
|base architecture=spiny-winged
 
|base architecture or shape=bractlike
 
|base position=distal
 
|base shape=decurrent,unlobed,less,deeply,shapdivided,than,proximal,divided,than,proximal
 
|blade arrangement=separated
 
|blade shape=oblanceolate,elliptic,unlobed,spinulose,dentate,pinnatifid,linear,lance-triangular,spinulose,few,lobed
 
|body shape=entire
 
|branch orientation=ascending
 
 
|chromosome count=32,34,36
 
|chromosome count=32,34,36
|collar variability=differentiated
+
|corolla coloration=white,lavender
|corolla coloration=dull,lavender-tinged,bright
+
|flowering time=summer,jun,jul,aug
|cypsela coloration=brown
+
|face architecture=spinier,than,basal,winged-petiolate,sessile
+
|face arrangement=distributed
+
|face coloration=adaxial,green
+
|face count=present
+
|face external texture=gray-tomentose,glabrate,tomentose,glabrate
+
|face other=principal
+
|face other or position=proximal
+
|face position=basal,cauline,mid
+
|face size=reduced
+
|head arrangement=crowded
+
|involucre external texture=glabrous,floccose
+
|involucre shape=ovoid,hemispheric,campanulate
+
|phyllary arrangement=imbricate
+
|phyllary coloration=greenish,brown
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|phyllary shape=ovate,linear-lanceolate,linear
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|phyllary size=subequal
+
|spine orientation=ascending,spreading
+
|spine width=fine
+
|stem external texture=gray-tomentose
+
|stem orientation=erect
+
|trichome architecture=non-septate
+
|trichome width=fine
+
|whole organism architecture=taprooted
+
|whole organism life style=biennial,perennial
+
|flowering time=summer,fall,nov,jun,jul,aug,sep,oct
+
 
}}
 
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Cirsium inamoenum is a variable complex across the northern Great Basin and adjacent mountains. A. Cronquist (1994) treated this complex as a single species under the name C. subniveum without infraspecific taxa and including taxa that formerly had been assigned to C. utahense (e.g., J. T. Howell 1960b). Some populations consist of small-headed, white-flowered plants with strong involucres and short, appressed phyllaries. Others have larger heads, white or lavender to pink-purple corollas, and phyllaries with longer, ascending to spreading tips. My treatment of this complex as C. inamoenum is similarly inclusive as was Cronquist’s treatment of C. subniveum, except that I believe C. humboldtense, which Cronquist included, is probably a derivative of hybridization between C. subniveum and C. eatonii var. peckii. I have observed such hybrids on the slopes of Steens Mountain in Harney County, Oregon, and the type of C. humboldtense closely resembles some of the introgressants. I have examined several other specimens that are likely the products of hybridization of C. inamoenum with other varieties of C. eatonii.
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Variety inamoenum grows from the rainshadow slopes of the Sierra Nevada and Cascades eastward across the northern Basin and Range province to the mountains of southern Idaho, western Wyoming, and northeastern Utah. On the slopes of Steens Mountain in eastern Oregon it forms hybrids with Cirsium eatonii var. peckii. In the Snake Range it apparently hybridizes with C. eatonii var. viperinum.

Revision as of 20:13, 28 November 2013


Variety inamoenum grows from the rainshadow slopes of the Sierra Nevada and Cascades eastward across the northern Basin and Range province to the mountains of southern Idaho, western Wyoming, and northeastern Utah. On the slopes of Steens Mountain in eastern Oregon it forms hybrids with Cirsium eatonii var. peckii. In the Snake Range it apparently hybridizes with C. eatonii var. viperinum.