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Echinocereus viridiflorus var. russanthus
Cactus
It's Echinocereus for sure. viridiflorus is my best guess for species. There are probably over 30 varieties of this species and without seeing the flower I have to go with russanthus, but I could easily be wrong.
Spotted on May 26, 2012
Submitted on May 27, 2012
