Pilosocereus

Pilosocereus (from Latin, 'hairy cereus') is a genus of cactus. Tree cactus is a common name for Pilosocereus species. The commonly cultivated Pilosocereus pachycladus (syn. Pilosocerus azureus) is a blue cactus with hairy areoles that emit golden spines. The genera Pilocereus K.Schum. and Pseudopilocereus Buxb. are synonyms of this genus.