Family: Asteraceae Aster Family
Genus: Cirsium Thistle
Spiny, biennial or perennial herbs (rarely annuals). Thistles of the genus Cirsium are distinguished by their feathery pappus from members of the genus Carduus (plumeless or simple pappus).
Scientific Name: Cirsium arvense (L.) Scop.
Common Name(s): Canada Thistle, Field Thistle, Creeping Thistle, Californian Thistle
Growth Type: perennial
Species Description:
Click on the thumbnails to view large image.
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ID: Hrb-CIRAR-001
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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ID: Hrb-CIRAR-002
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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ID: Hrb-CIRAR-003
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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ID: Hrb-CIRAR-004
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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 | Caption:
ID: Hrb-CIRAR-005
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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ID: Hrb-CIRAR-006
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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ID: Hrb-CIRAR-007
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, seedling
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 | Caption:
ID: Hrb-CIRAR-008
Source: 35mm slide (photo)
Credit:
Keyword(s): vegetative
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 | Caption:
ID: Hrb-CIRAR-009
Source: 35mm slide (photo)
Credit:
Keyword(s): seedling
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 | Caption:
ID: Hrb-CIRAR-010
Source: 35mm slide (photo)
Credit:
Keyword(s): seedling
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 | Caption:
ID: Hrb-CIRAR-011
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-012
Source: 35mm slide (illustration)
Credit:
Keyword(s): leaf
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 | Caption:
ID: Hrb-CIRAR-013
Source: 35mm slide (photo)
Credit:
Keyword(s): mature, vegetative
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 | Caption:
ID: Hrb-CIRAR-014
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-015
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-016
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense, vegetative
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 | Caption:
ID: Hrb-CIRAR-017
Source: 35mm slide (illustration)
Credit:
Keyword(s): leaf, root
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 | Caption:
ID: Hrb-CIRAR-018
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense, vegetative
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 | Caption:
ID: Hrb-CIRAR-019
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-020
Source: 35mm slide (photo)
Credit:
Keyword(s): inflorescense, mature
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 | Caption:
ID: Hrb-CIRAR-021
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense, vegetative
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 | Caption:
ID: Hrb-CIRAR-022
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, stem, vegetative
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 | Caption:
ID: Hrb-CIRAR-023
Source: 35mm slide (photo)
Credit:
Keyword(s): mature
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 | Caption:
ID: Hrb-CIRAR-024
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense, vegetative
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 | Caption:
ID: Hrb-CIRAR-025
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-026
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-027
Source: 35mm slide (photo)
Credit:
Keyword(s): inflorescense, mature
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 | Caption:
ID: Hrb-CIRAR-028
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf
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 | Caption:
ID: Hrb-CIRAR-029
Source: 35mm slide (photo)
Credit:
Keyword(s): seedling
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 | Caption:
ID: Hrb-CIRAR-030
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, vegetative
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 | Caption:
ID: Hrb-CIRAR-031
Source: 35mm slide (photo)
Credit:
Keyword(s): inflorescense, mature
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 | Caption:
ID: Hrb-CIRAR-032
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption:
ID: Hrb-CIRAR-033
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-034
Source: 35mm slide (illustration)
Credit:
Keyword(s): root
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 | Caption:
ID: Hrb-CIRAR-035
Source: 35mm slide (photo)
Credit:
Keyword(s): inflorescense, mature
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 | Caption:
ID: Hrb-CIRAR-036
Source: 35mm slide (illustration)
Credit:
Keyword(s): mature
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 | Caption:
ID: Hrb-CIRAR-037
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption:
ID: Hrb-CIRAR-038
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption:
ID: Hrb-CIRAR-039
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, vegetative
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 | Caption:
ID: Hrb-CIRAR-040
Source: 35mm slide (photo)
Credit:
Keyword(s): leaf, vegetative
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 | Caption:
ID: Hrb-CIRAR-041
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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 | Caption:
ID: Hrb-CIRAR-042
Source: 35mm slide (photo)
Credit:
Keyword(s): seedling
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 | Caption:
ID: Hrb-CIRAR-043
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption:
ID: Hrb-CIRAR-044
Source: 35mm slide (photo)
Credit:
Keyword(s): seed
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 | Caption:
ID: Hrb-CIRAR-045
Source: 35mm slide (photo)
Credit:
Keyword(s): mature
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 | Caption:
ID: Hrb-CIRAR-046
Source: 35mm slide (photo)
Credit:
Keyword(s): flowering, inflorescense
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