Pilosocereus polygonus

Pilosocereus polygonus
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Genus:	Pilosocereus
Species:	P. polygonus
Binomial name
	Pilosocereus polygonus; (Lam.) Byles & G.D.Rowley
Synonyms
	List Cactus polygonus Lam. ; Cactus royenii L. ; Cephalocereus monoclonos (DC.) Britton & Rose ; Cephalocereus polygonus (Lam.) Britton & Rose ; Cephalocereus royenii (L.) Britton & Rose ; Cephalocereus schlumbergeri (F.A.C.Weber ex K.Schum.) Urb. ; Cereus monoclonos DC. ; Cereus polygonus (Lam.) DC. ; Cereus royenii (L.) Mill. ; Pilocereus monoclonos (DC.) F.M.Knuth ; Pilocereus plumieri Lem. ; Pilocereus polygonus (Lam.) Salm-Dyck ; Pilocereus royenii (L.) Haw. ex Rümpler ; Pilocereus schlumbergeri F.A.C.Weber ex K.Schum. ; Pilosocereus monoclonos (DC.) Byles & G.D.Rowley ; Pilosocereus royenii (L.) Byles & G.D.Rowley, tentatively listed as a synonym. ;

Pilosocereus polygonus is a species of Pilosocereus. Its synonyms include Pilosocereus royenii, which has also been treated as a separate species. The species is native to Hispaniola, but it is found elsewhere in the Caribbean. English names include dildo cactus, pipe organ cactus, and Royen's tree cactus.