title: A new species in the tree genus Polyceratocarpus (Annonaceae) from the Udzungwa Mountains of Tanzania.
abstract: Polyceratocarpus askhambryan-iringae, an endemic tree species of Annonaceae from the Udzungwa Mountains of Tanzania, is described and illustrated. The new species is identified as a member of the genus Polyceratocarpus by the combination of staminate and bisexual flowers, axillary inflorescences, subequal outer and inner petals, and multi-seeded monocarps with pitted seeds. From Polyceratocarpus scheffleri, with which it has previously been confused, it differs in the longer pedicels, smaller and thinner petals, shorter bracts, and by generally smaller, less curved monocarps that have a clear stipe and usually have fewer seeds. Because Polyceratocarpus askhambryan-iringae has a restricted extent of occurrence, area of occupancy, and ongoing degradation of its forest habitat, we recommend classification of it as Endangered (EN) on the IUCN Red List.
authors.affiliation: CIRCLE, Environment Department, University of York, York, UK; Flamingo Land Ltd., Kirby Misperton, North Yorkshire, UK.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Marshall
authors.affiliation: Institut de Recherche pour le Développement, UMR-DIADE, BP 64501, F-34394 Montpellier cedex 5, France; Université de Yaoundé I, Ecole Normale Supérieure, Département des Sciences Biologiques, Laboratoire de Botanique systématique et d'Ecologie, B.P. 047, Yaoundé, Cameroon; Netherlands Centre for Biodiversity Naturalis (section NHN), Biosystematics Group, Wageningen University, the Netherlands.
authors.forename: Thomas L P
authors.initials: TL
authors.lastname: Couvreur
authors.affiliation: CIRCLE, Environment Department, University of York, York, UK; Flamingo Land Ltd., Kirby Misperton, North Yorkshire, UK; Biology Department, University of York, York, UK.
authors.forename: Abigail L
authors.initials: AL
authors.lastname: Summers
authors.affiliation: CIRCLE, Environment Department, University of York, York, UK; Durrell Institute of Conservation and Ecology, School of Anthropology and Conservation, University of Kent, Canterbury, UK.
authors.forename: Nicolas J
authors.initials: NJ
authors.lastname: Deere
authors.affiliation: East African Herbarium, National Museums of Kenya, Nairobi, Kenya.
authors.forename: W R Quentin
authors.initials: WR
authors.lastname: Luke
authors.affiliation: Department of Botany, University of Dar es Salaam, Dar es Salaam, Tanzania.
authors.forename: Henry J
authors.initials: HJ
authors.lastname: Ndangalasi
authors.affiliation: Biology Department, University of York, York, UK.
authors.forename: Sue
authors.initials: S
authors.lastname: Sparrow
authors.affiliation: Department of Botany & Microbiology, Ohio Wesleyan University, Delaware, Ohio 43015 USA.
authors.forename: David M
authors.initials: DM
authors.lastname: Johnson
keywords: East Africa; Eastern Arc; Ndundulu; Polyceratocarpus; endemism