Picture from English Wikipedia.

• Uploaded 17:30, 11 August 2004 .by user . JoJan (Talk | contribs) . . 460×381 (65,688 bytes) (Lactuca serriola2.jpg (Prickly Lettuce)) Lactuca serriola2.jpg (Prickly Lettuce)

Credit: U. S. Geological Survey USGS/Ft. Collins, CO (if originating office but not the artist is known)

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Lactuca serriola