Opuntia polyacantha var. erinacea Old Man Cactus ID: 0000 0000 0309 0931 [detail] © 2009 Aaron Schusteff

Opuntia polyacantha var. erinacea Old Man Cactus ID: 0000 0000 0309 0933 [detail] © 2009 Aaron Schusteff

Pachycereus schottii Senita ID: 0000 0000 0106 0917 [detail] © 2006 Joseph Dougherty/ecology.org

Pachycereus schottii Senita ID: 0000 0000 0508 2341 [detail] © 2008 Joseph Dougherty, M.D./ecology.org

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