The multi-armed, tall cactus disappeared since 1968

Altitude level 1: 0-6 feet Altitude level 2: 6-12 feet Altitude level 3: 12-18 Altitude level 4: 18-24 Altitude level 5: More than 24 feet Saguaro Census data downloaded from: Orum, Thomas V. ; Ferguson, Nancy; Mihail, Jeanne D. (2017), data from: Cactus (Carnegiea gigantea) mortality and population regeneration in the cactus forest of Cactus National Park: Seventy-five years and counting, Dryad, data set,


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