Pilosocereus armatus

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Pilosocereus armatus

Pilosocereus armatus (Otto ex Pfeiff.) A.R.Franck in Willdenowia 51: 264. 2021 sec. Franck 2021
  • Cereus armatus Otto ex Pfeiff., Enum. Diagn. Cact.: 81. 1837 syn. sec. Franck 2021
  • Cereus royenii var. armatus Salm-Dyck ex Walp., Repert. Bot. Syst. 2: 276. 1843 syn. sec. Franck 2021
  • Pilocereus royenii var. armatus Salm-Dyck ex Rümpler, Handb. Cacteenk., ed. 2, 2(16): 682. 1886 syn. sec. Franck 2021
    • Type: Neotype: St. Thomas, Water Island, 22 Feb 1978, Howard 18569 (A00368334 [3 mounted photographs])1
  • 1. Franck, A.R., Barrios, D., Campbell, K.C.St.E., Lange, J., Peguero, B., Santiago-Valentín, E., Rigerszki, Z., Haakonsson, J., Gann, G.D., Cinea, W., Howe, N.M.M., St. John, J., Moreno, J.S. & Clark, C.A. 2019: Revision of Pilosocereus (Cactaceae) in the Caribbean and northern Andean region. – Phytotaxa 411(3): 129–182: 170


The earliest available basionym for the Pilosocereus Byles & G.D.Rowley cacti of Puerto Rico and the Virgin Islands appears to be Cereus armatus. The protologue of C. armatus described the stems as “vix glaucescens”, which may pertain to cultivated young plants or stressed or older stems that are sometimes not as bluish glaucescent as are mature, vigorous stems. The use of P. royenii (L.) Byles & G.D.Rowley for these plants by Franck & al. (2019) cannot be followed because it overlooked the designation of neotype for Cactus royenii L. made by Mottram (2013). Both the neotype and the protologue of C. royenii (Linnaeus 1753) are ambiguous with regard to provenance and precise identity.A


A. Franck, A. R. 2021: Revisions of Cereus, Estevesia, Harrisia, Pilosocereus, Stenocereus, Xiquexique – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270