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Issue: Vol. 323 No. 2: 29 September 2017
Type: Article
Published: 2017-09-29
DOI: 10.11646/phytotaxa.323.2.3
Page range: 143–158
Abstract views: 22
PDF downloaded: 1

Taxonomy of Atlantic Central African orchids, 6: three new species of Angraecum sect. Afrangraecum (Orchidaceae, Angraecinae) from Gabon and São Tomé

Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels
AMAP, IRD, CNRS, INRA, Université de Montpellier, Montpellier Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels Missouri Botanical Garden (MBG), Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.
Herbier National du Gabon, Iphametra, Centre National de la Recherche Scientifique et Technologique (CENAREST)
Herbier National du Gabon, Iphametra, Centre National de la Recherche Scientifique et Technologique (CENAREST)
Herbier National du Gabon, Iphametra, Centre National de la Recherche Scientifique et Technologique (CENAREST)
Jardi-Gab, B.P. 2345 Libreville
Herbarium et Bibliothèque de Botanique africaine, CP 265, Université Libre de Bruxelles, Boulevard du Triomphe, B-1050 Brussels Missouri Botanical Garden (MBG), Africa & Madagascar Department, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. Botanic Garden, Meise, Domein van Bouchout, Nieuwelaan 38, B-1860 Meise, Belgium
Angraecoid orchid Bombaim Massif du Chaillu Formoso Grande Io Grande valley IUCN Red List Categories and Criteria Mont Songo Ndjolé Ôbo National Park Monocots

Abstract

Three new species of Angraecum sect. Afrangraecum from Central Africa are here described and illustrated. They are morphologically similar to A. affine and A. cribbianum. Two of them, A. gereauanum and A. geerinckianum, are only known from Massif du Chaillu in Gabon and appear to be closely related based on morphological and preliminary molecular evidence. The third species, A. oliveirae, is endemic to São Tomé. A dichotomous key to all fourteen species of A. sect. Afrangraecum and a table with the distinguishing characters of the three new species and closely allied taxa are provided. A preliminary assessment of the conservation status of the new species is also presented, using the IUCN Red List categories and criteria.