Ferocactus robustus

This cactus, the Ferocactus robustus can form clumps of plants up to 4 feet high and 16 feet in diameter. They are found in the Mexican States of Puebla and Veracruz. N. L. Britton, J. N. Rose (1922) (in German), The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family, Band III, Washington: The Carnegie Institution of Washington, pp. 133. It is a red alert threatened species.