Medford Leas Residents Assn.
Wildflowers Home Page

Cirsium arvense
Canada Thistle
Asteraceae

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Interesting info and more photos:

see missouriplants.com

Canada Thistle
Dan Teglia - missouriplants.com

You ought to know:

Area: dry

Height: 1-5 feet

Frequency: low

Blooms: Late Spring