Cirsium arvense
(Canada Thistle, Creeping Thistle, Californian Thistle)

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USA Images: (Click on thumbnail images for a closer view) Male inflorescence Female inflorescence 1 Female inflorescence 2 Female inflorescence 3 Flowerheads I Flowerheads II View of flowers Seedheads Plants View of plant Creekside Sea of trouble w/white foliage NZ Images: (Click on thumbnail images for a closer view) NZ flowers I NZ flowers II NZ flowers III