Pilosocereus royenii (L.) Byles & Rowley

Pilosocereus royenii (L.) Byles & Rowley. Pilosocereus royenii is a name which has been used in different senses for a species of cactus. In the past, it has been treated as a distinct species with a wide distribution in the Caribbean and Mexico. As of June 2025, it is not accepted by Plants of the World Online.Populations in Puerto Rico and the Virgin Islands that have been treated as the variety armatus of Pilosocereus royenii are considered to be Pilosocereus armatus (Otto ex Pfeiff.) A.R.Franck. Populations in southeast Cuba that have been treated as the variety brooksianus of Pilosocereus royenii are considered to be Pilosocereus brooksianus (Britton & Rose) Byles & G.D.Rowley Populations in Mexico that have been called by this name are considered to be Pilosocereus gaumeri (Britton & Rose) Backeb. Pilosocereus royenii has been treated as a possible synonym of Pilosocereus polygonus (Lam.) Byles & G.D.Rowley, e.g. by Plants of the World Online.