Canada Thistle, Creeping Thistle
Cirsium arvense
Canada thistle as seen along Road #16 at Summit Prairie, Malheur National Forest................August 20, 2011.
Close-up of the involucral bracts of Canada thistle as seen along Road #16 at Summit Prairie, Malheur National Forest................August 20, 2011.
- 
- 
Close-ups of the inflorescence and a leaf of Canada thistle as seen along Road #23 at the Mt.
Adams viewpoint at the southwestern corner of Mt. Adams................August
6, 2005.
The photo above shows a close-up of a stem
leaf of Canada thistle as seen along Road #23 at the Mt. Adams viewpoint at
the southwestern corner of Mt. Adams................August 6, 2005. The
stem leaves of Canada thistle are not as deeply lobed as those of bull
thistle (Cirsium vulgare).
A view of Canada thistle as seen along forest road #3521 in the Wenatchee National Forest...................August 13, 2009.
Paul Slichter