Bull Thistle (Spear Thistle)
Bull thistle, Cirsium vulgare (Savi) Tenore, is an invasive thistle from Eurasia, found throughout the United States and in Canada from Newfoundland to British Columbia. It is capable of invading fields, pastures, wastelands and along roadsides, but will not survive in cultivated fields.
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DigitalCommons@University of Nebraska - Lincoln
2002
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Online Access: | https://digitalcommons.unl.edu/usdafsfacpub/100 https://digitalcommons.unl.edu/context/usdafsfacpub/article/1099/viewcontent/Kok_BCIPEUS_2002_BullThistle.pdf |