Difference between revisions of "Cirsium scariosum"

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|age development=developing
 
|age development=developing
 
|apex arrangement or shape=contorted
 
|apex arrangement or shape=contorted
|apex shape=acuminate,entire,toothed
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|apex size=expanded
|apex width=thin
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|appendage external texture=scarious
|array architecture=congested,subcapitate
+
|appendage shape=erose-toothed
|blade shape=oblanceolate,elliptic,lobed
+
|array architecture=corymbiform,subcapitate
|chromosome count=34
+
|corolla coloration=white
|corolla coloration=white,purple-tinged,purple
+
|head architecture=pedunculate
|face coloration=green
+
|face external texture=glabrous,glabrate,tomentose,glabrous,villous,arachnoid-tomentose
+
|head architecture=subsessile,short-pedunculate
+
 
|head arrangement or habit=clustered
 
|head arrangement or habit=clustered
 
|head size=reduced
 
|head size=reduced
 +
|leaf shape=oblanceolate,elliptic,lobed
 
|phyllary position=outer
 
|phyllary position=outer
 
|phyllary shape=mid,ovate
 
|phyllary shape=mid,ovate
|spine fragility=weak
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|spine external texture=arachnoid-tomentose,villous,villous,arachnoid-tomentose
 +
|spine fragility=stout
 
|spine height or length=shorter
 
|spine height or length=shorter
 
|spine length=longer
 
|spine length=longer
|spine prominence or shape=flat
+
|spine position=abaxial,adaxial
|spine size=slender
+
|spine size=slender,1,slender
|stem architecture=branched,leafy
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|stem architecture=branched,branched,leafy
|stem count=1
+
|stem atypical count=1
|stem external texture=glabrous,arachnoid-tomentose
+
|stem external texture=glabrous,villous,arachnoid-tomentose
|trichome architecture=septate
+
|stem fragility=stout
|whole organism architecture=acaulescent
+
|trichome architecture=septate,septate,septate
|whole organism habit=bushy,mounding
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|whole organism architecture=caulescent
 
|whole organism life style=plant
 
|whole organism life style=plant
|whole organism orientation=erect
+
|flowering time=summer,aug,jun,jul
|flowering time=spring,mar,summer,aug,apr,may,jun,jul,late,nov,fall
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Variety citrinum is the southern California race of Cirsium scariosum. As is the case in other varieties of this complex, taxonomic recognition has been given to local populations, named on the basis of limited samples. After examining specimens gathered from various populations in southern California, I realized that although exemplars of local populations may have distinctive features, there are so many intermediates that recognizing any of the local races becomes arbitrary. Individuals treated as Cirsium loncholepis (from coastal sites bordering the mouth of the Santa Maria River and adjacent regions in San Luis Obispo and Santa Barbara counties) are often indistinguishable from plants of upland populations of the San Emigdio Mountains (Kern and Ventura counties) in the vicinity of the headwaters of the Cuyama River, a tributary of the Santa Maria River. Other individuals from the San Emigdio Mountains cannot be distinguished from plants of other upland and lowland southern California sites ranging south to San Diego County.
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Variety robustum is known only from northern California (Siskiyou County) and south central Oregon (Klamath and Lake counties). It differs from var. scariosum in its larger, evidently pedunculate heads.

Revision as of 19:15, 28 November 2013


Variety robustum is known only from northern California (Siskiyou County) and south central Oregon (Klamath and Lake counties). It differs from var. scariosum in its larger, evidently pedunculate heads.