Carduus pycnocephalus ID: 0000 0000 0911 0336 [detail] © 2011 Steven Thorsted	Cirsium arvense Canada thistle ID: 0000 0000 0114 1657 [detail] © 2014 John Doyen	Cirsium arvense Canada thistle ID: 0000 0000 0114 1656 [detail] © 2014 John Doyen	Cirsium arvense Canada thistle ID: 0000 0000 0114 1653 [detail] © 2014 John Doyen
Cirsium arvense Canada thistle ID: 0000 0000 0114 1654 [detail] © 2014 John Doyen	Xanthium strumarium Cocklebur ID: 0000 0000 0413 1560 [detail] © 2013 Jean Pawek

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