Stenocereus thurberi

The organ pipe cactus. In the US it is limited to Organ Pipe Cactus National Monument and nearby.

Plant habit near the campground at Organ Pipe Cactus National Monument, Pima County, Arizona, 5 Feb 2005.

Closer view of a stem at Organ Pipe, 5 Feb 2005.

Plant habit in Barranca de Batopilas, Chihuahua, Mexico, 22 Mar 2007.

Plant habit near San Carlos, Sonora, Mexico, 27 Oct 2006.