(Pilosocereus aurisetus)
Pilosocereus (from Latin, "hairy cereus") is a genus of cactus native to the Neotropics. 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.