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Project Noah Nature School
Cirsium vulgare
Spiny leaves with a pretty purple flower.
Thistles are considered an invasive species in Oregon. They grow just about everywhere, are extremely hardy and difficult to control. This one was spotted in a natural area at Elk Rock Island along the Willamette River in Milwaukie, Oregon.
Spotted on Sep 5, 2012
Submitted on Sep 5, 2012
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