Cirsium arvense
Canada thistle, Field thistle, CANADA THISTLE, Canadian thistle Taxonomy
Synonyms: Cirsium arvense horridum Subspecific taxa: Classification:
Other taxonomic & nomenclature sources: USDA Plants;  ITIS;  The Plant List;  IPNI Images
   
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Species Distribution
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County Map Legend
Absent: Not known from county Medium confidence: Medium or unknown confidence; often old records or unverifiable observations Medium-high confidence: Often observations by expert botanists High confidence: Often vouchered herbarium records Planted / introduced: Native species introduced outside historic range, or only in planted locations within county (e.g., restorations) Historic / extirpated: Only historic records for the species; likely extirpated (Note that this category is not yet functional) North American distribution maps for this species: FLNA;  USDA Plants;  BONAP;  BISON
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Species Status
Status/Listing: No Information Notes: Origin: Europe
Species Description
General: Dicot-herb, perennial Roots: adventitious, rhizomes Shoots: alternate leaf arrangment; simple leaf type; serrate, lobed (pinnately), parted (pinnately) leaf margin; Pinnate leaf venation; oblong leaf shape Inflorescence: head Flowers: complete, regular; violet, white; epigynous ovary position Fruit: achene Physiology: autotrophic; C3 C02 fixation Reproduction: sexual, vegetative
Ecology & Natural History
Habitat: Wastegrounds, roads, along railroads, an abundant and pernicious weed of pastures and cultivated ground. Species is distributed in waste grounds, roads and along railroads. It is an abundant and pernicious weed of pastures and cultivated ground. ILPIN Notes: Noxious in PIN _ UT, CO, WY, MT, and ND. Sometimes dioecious by abortion; found in colonies. Includes several varieties. Illinois species, which are biennial and form rosettes the first year and flower The perennial habit and creeping underground stolons seperated this from other in the second year. Goldfinches fond of fruits. Goldfinches are fond of fruits. Species may be monoecious or dioecious. Sometimes it is dioecious by abortion. Its creeping underground rhizomes, are found in colonies. Species is more common than var. arvense. Compared to other varieties, this one has more deeply pinnatifid and spinier leaves. Functional Relationships:
Human Relationships:
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