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A photograph of a cannabis plant.
The photo is from [1], specifically CASA1_LF.jpg. (If the links expire, the photo can be found by searching for "cannabis" at the GIMP photo archive.)
The photo at that site is marked as being copyright-free, and is credited to the United States Fish and Wildlife Service.
A thumbnail of this photo was originally uploaded to the English Wikipedia by w:User:AxelBoldt.
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