Pachycereus is a genus of large cacti native to Central America and Mexico. They form large shrubs or small trees up to 15 m tall, with stout stems up to 1 m in diameter. Pachycereus comes from the ancient Greek ÃÂñÃÂÃÂà(pachys) meaning "thick" and the Latin cereus meaning "torch".
, Plants of the World Online accepted six species:
P. pringlei is the tallest cactus species in the world, with a maximum recorded height of 19.2 m.
These genera have been brought into synonymy with Pachycereus by some sources, although , not by Plants of the World Online:
Species that may be placed in Pachycereus include: