title: A new species of Pandanaceae from northern Madagascar, Pandanus ankaranensis.
abstract: A new species, Pandanus ankaranensis Callm. & Laivao (Pandanaceae), is described from the karst region of Ankarana in northern Madagascar. It resembles P. grallatus B. C. Stone, another member of Pandanus sect. Mammillares H. St. John occurring in the area. The new taxon can be distinguished by its larger and wider leaves that are persistent on the branches, the stipe often lying on the rocks where plants grow, and its larger syncarps. Pandanus ankaranensis is classified as Vulnerable based on the IUCN Red List criteria.
authors.affiliation: Missouri Botanical Garden, P.O. Box 299, St. Louis, MO 63166-0299, U.S.A., and Conservatoire et Jardin botaniques de la Ville de Genève, ch. de l'Impératrice 1, CP 60, 1292 Chambésy, Switzerland.  martin.callmander@mobot.org.
authors.forename: Martin W
authors.initials: MW
authors.lastname: Callmander
authors.forename: Michel O
authors.initials: MO
authors.lastname: Laivao
authors.forename: Richard
authors.initials: R
authors.lastname: Randrianaivo