title: Taxonomy of Atlantic Central African orchids 5. A new species of Angraecum sect. Conchoglossum (Orchidaceae, Angraecinae) from Gabon and Cameroon.
abstract: Recent field inventories and taxonomic research in Central Africa have resulted in the discovery of many new orchid species. Five specimens of an apparently new Angraecum species were collected in Gabon and Cameroon. They stand out for their hanging habit and short zig-zag stem. Morphology of leaves and habit is somewhat comparable to Angraecum cultriforme and Angraecum stolzii, two species from East Africa. Flowers of the novelty share the general morphology of Angraecum pyriforme from which the new species is distinguished by being smaller and with a different lip-spur ratio. Here we show that these five specimens represent a new species, described here as Angraecum lanceolatum. The distinguishing traits include thin lanceolate leaves, convolute distally, with a rhombic lip shape. Dichotomous key to four Central African species of sect. Conchoglossum and a table of the diagnostic characters of the seven related Continental African Angraecum taxa are included here. A preliminary assessment of the conservation status of Angraecum lanceolatum is provided, using the IUCN Red List Categories and Criteria.
authors.affiliation: Laboratoire d'Écologie végétale et Biogéochimie, CP 244, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium; Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Ječmenica
authors.affiliation: Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium; Institut de Recherche pour le Développement (IRD), Unité Mixte de Recherche AMAP (Botanique et Bioinformatique de l'Architecture des Plantes), Boulevard de la Lironde, TA A-51/PS2, F-34398 Montpellier Cedex 5, France; Missouri Botanical Garden (MBG), Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.
authors.forename: Vincent
authors.initials: V
authors.lastname: Droissart
authors.affiliation: Laboratoire d'Écologie végétale et Biogéochimie, CP 244, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium.
authors.forename: Nausicaa
authors.initials: N
authors.lastname: Noret
authors.affiliation: Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels, Belgium; Missouri Botanical Garden (MBG), Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.
authors.forename: Tariq
authors.initials: T
authors.lastname: Stévart
keywords: Angraecoid; Campo-Ma’an National Park; IUCN Red List Categories and Criteria; Ivindo National Park; Monts de Cristal National Park