Echinocereus viridiflorus var. davisii (A.D. Houghton) W.T. Marsh.  
Family: Cactaceae
Davis' Hedgehog Cactus,  more...
[Echinocereus davisii A.D. Houghton]
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Echinocereus viridiflorus var. davisii
The National Science Foundation
This project made possible by National Science Foundation Award 1410069