Canada Thistle Cirsium arvense (Linnaeus) ScopoliNon-native  -  Invasive  Synonyms: Carduus arvensis, Creeping Thistle.

There are 206 records in the project database.

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Canada Thistle in Caroline Co., Maryland (6/5/2016). Photo by Wayne Longbottom. (MBP list)

Canada Thistle in Queen Anne's Co., Maryland (7/5/2016). Photo by Wayne Longbottom. (MBP list)

Canada Thistle in Howard Co., Maryland (5/22/2010). Photo by Bill Harms. (MBP list)

Canada Thistle blooming in Somerset Co., Maryland (6/2013). Photo by Lance Biechele. (MBP list)

Blooming Canada Thistle in Baltimore Co., Maryland (6/23/2013). Photo by Jim Brighton. (MBP list)

Canada Thistle blooming in Calvert Co., Maryland (6/14/2014). Photo by John Hall. (MBP list)

Canada Thistle blooming in Frederick Co., Maryland (6/25/2016). Photo by Richard Orr. (MBP list)

Canada Thistle blooming in Harford Co., Maryland (6/9/2018). Photo by Josh Emm. (MBP list)

Canada Thistle blooming in Allegany Co., Maryland (6/30/2013). Photo by Kimberly Booth. (MBP list)

The basal leaves of Canada Thistle in Kent Co., Maryland (4/3/2016). Photo by Nancy Martin. (MBP list)

Canada Thistle in Baltimore Co., Maryland (6/28/1981). Photo by Jim Stasz. (MBP list)

Canada Thistle blooming in Carroll Co., Maryland (6/26/1994). Photo by Bob Ringler. (MBP list)


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