Photo: Carnegiea gigantea 5.

Botanical name: 
Photo: Carnegiea gigantea 5.

Closeup of trunk. The damage can be due to sandstorms (with small stones whizzing around in the air), or perhaps somebody has been using the cactus as target practice. Saguaro Nat'l monument, AZ, US. Wild. 1998-03-01.

Carnegiea gigantea (Engelm.) Britt & Rose
Engl.: saguaro, giant cactus, saguaro cactus.
Deu.: Riesenkaktus, Saguaro, Saguaro Kaktus.
Sven.: saguaro-kaktus.
Bot. syn.: Carnegia gigantea (Engelm.) Britt. & Rose, Cereus giganteus Engelm., Pilocereus giganteus (Engelm.) Rümpler