Pachycereus marginatus is a species of plant in the family Cactaceae. (Also sometimes called "Mexican Fencepost Cactus".) It has columnar trunks that grow slowly to 12 feet (3.7m) and may reach 20 feet (6.1m) in height. Stems are 3 to 4 inches (9–10 cm) in diameter; ribs 5 to 7 inches (13–18 cm). Its central spine is about 3/8 inch (1 cm) in diameter with 5-9 radials and slightly yellowish in colour. Its cuttings are sometimes used to create fences as its spines are not as large or dangerous as some cacti.
- "Mexican Fencepost Cactus". Xeriscape Landscaping Plants For The Arizona Desert Environment. Pictures, Photos, Information, Descriptions. Retrieved 11 March 2015.
- NL Britton, JN Rose, (1909). The genus Cereus and its allies in North America.
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