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Cirsium arvense (L.) Scop.
Canada Thistle
Asteraceae — Aster family
Invasive non-native
Cirsium arvense
White Clay Creek State Park -- Possum Hill
June 2001
Cirsium arvense
Prides Crossing
September 2009
Cirsium arvense
White Clay Creek State Park -- Possum Hill
June 2011
Cirsium arvense
White Clay Creek State Park -- Possum Hill
May 2020