![](https://nthumb.tpgimages.com/mid2_com_img/28103/24044/TOP22254055.jpg)
Nodding thistle, Carduus nutans. This biennial, noxious, introduced weed is not in the true thistle genus, Cirsium. It is easily identified by the extraordinarily developed spine-tipped bracts on the flower's recepticle. It is firmly established throughout almost all of temperate North America from Canada south into Mexico. Photo taken Dallas Co., TX
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TOP22254055
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達志影像
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RM
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