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Article
Published: 2016-10-19

A taxonomic revision of Angraecum section Dolabrifolia (Orchidaceae, Angraecinae), with the description of a new species from Gabon

Plant Systematics and Ecology Laboratory, Higher Teacher’s Training College, University of Yaoundé I, P.O. Box 047, Yaoundé, Cameroon
Plant Systematics and Ecology Laboratory, Higher Teacher’s Training College, University of Yaoundé I, P.O. Box 047, Yaoundé, Cameroon Missouri Botanical Garden, Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. Evolutionary Biology and Ecology, Faculty of Sciences, CP 160/12, Université Libre de Bruxelles, Brussels, Belgium. Herbarium et Bibliothèque de Botanique africaine, Université Libre de Bruxelles, Campus de la Plaine CP 265, Boulevard du Triomphe 1050, Brussels, Belgium.
Plant Systematics and Ecology Laboratory, Higher Teacher’s Training College, University of Yaoundé I, P.O. Box 047, Yaoundé, Cameroon Missouri Botanical Garden, Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. Institut de Recherche pour le Développement (IRD), Unité Mixte de Recherche 123 AMAP (BotAnique et Modélisation de l’Architecture des Plantes et des végétations), Montpellier, France. Herbarium et Bibliothèque de Botanique africaine, Université Libre de Bruxelles, Campus de la Plaine CP 265, Boulevard du Triomphe 1050, Brussels, Belgium.
Herbarium et Bibliothèque de Botanique africaine, Université Libre de Bruxelles, Campus de la Plaine CP 265, Boulevard du Triomphe 1050, Brussels, Belgium. Agentschap Plantentuin Meise, Domein van Bouchout, Nieuwelaan 38, BE-1860, Meise, Belgium.
Missouri Botanical Garden, Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. Institut de Systématique, Évolution, Biodiversité (ISYEB), Unité Mixte de Recherche 7205, Centre National de la Recherche Scientifique/Muséum National d‘Histoire Naturelle/École Pratique des Hautes Études, Université Pierre et Marie Curie, Sorbonne Universités, C.P. 39, 57 rue Cuvier, F-75231 Paris CEDEX 05, France.
Missouri Botanical Garden, Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. Herbarium et Bibliothèque de Botanique africaine, Université Libre de Bruxelles, Campus de la Plaine CP 265, Boulevard du Triomphe 1050, Brussels, Belgium. Agentschap Plantentuin Meise, Domein van Bouchout, Nieuwelaan 38, BE-1860, Meise, Belgium.
Angraecoid orchids distribution map identification key IUCN Red List categories and criteria West and Central Africa Monocots

Abstract

Despite a paucity of material available from continental Africa, previous morphological and molecular phylogenetic studies have suggested that Angraecum, the largest genus of the angraecoid orchids, is polyphyletic. A recent study based on broad sampling from the region confirmed the monophyly of section Dolabrifolia and a clear delimitation of four of its five members, one of which represents a new species. Based on these results, a comprehensive taxonomic revision of Angraecum sect. Dolabrifolia is presented here. It includes an identification key and a detailed description of each species, along with color photographs, distribution maps, information on habitat and phenology, and a preliminary risk of extinction assessment according to the IUCN Red List categories and criteria. Species richness in the section is highest in Atlantic Central Africa and around the Albertine Rift. The new species, A. biteaui, is described and illustrated with line drawings. It most closely resembles A. aporoides in general aspect but differs in both foliar and floral characters, and is only known from lowland forests in Gabon.