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
+
|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 22:15, 14 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.