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Cirsium arvense (Linn.) scop.
Canada thistle, field thistle
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Origin
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Introduced
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Citation
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Cronquist, 1955; Moore and Frankton, 1974
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Infra-Species
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var. horridum Wimm. & Grab. f. horridum
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Treatments in Other Floras @ www.efloras.org
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