New species and nomenclatural changes in Angraecum (Orchidaceae) from Madagascar
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ISSN: 0075-5974 (print) ISSN: 1874-933X (electronic)
New species and nomenclatural changes in Angraecum (Orchidaceae) from Madagascar Johan Hermans1,2 , Simon Verlynde3,4, Landy Rajaovelona5, Phillip J. Cribb1 & Jean-Michel Hervouet6
Summary. Three new species: Angraecum archangelicum, A. polyphemus and A. rotundifolium are described for the first
time. Pectinariella is evaluated; a case is made to keep it at subgeneric level and the necessary two new combinations are made. Angraecum dasycarpum is neotypified. Finally A. ochraceum and A. setipes are compared with the latter being reduced to a synonym of the former. Key Words. IUCN Red List assessments, new species descriptions, Pectinariella, taxonomy, Vandeae.
Introduction Angraecum Bory (1804: t. 19) comprises around 225 species, occurring mainly in Africa, Madagascar and adjacent islands of the Indian Ocean. Madagascar has the greatest number of species, around 150, most of which are endemic (Hermans et al. 2007; Govaerts et al. 2018). Following the major work on the Madagascan angraecoid orchids by Schlechter (1918b, 1924) and Perrier de la Bâthie (henceforth Perrier) (1938, 1941), Garay (1973) produced a taxonomic revision of the genus at sectional level. Several investigations of the phylogeny and biogeography of the genus have recently been made (Michenau et al. 2008; Szlachetko et al. 2013; Andriananjamanantsoa et al. 2016; Simo-Droissart et al. 2018a). In addition Senghas (1964, 1997), Bosser (1970, 1988, 1989a & b, 2007), Hermans & Cribb (1997, 2005), Hermans & la Croix (2001), Hermans et al. (2002), Cribb et al. (2012), Verlynde et al. (2016) and Hermans (2017) have all recently described novelties in the genus from the island. Recent studies on the genus at Kew, the Missouri Botanical Garden, the University of Vienna, and PBZT Antananarivo have resulted in the recognition of a number of new species and a better understanding of their nomenclature. Three new species are described and several nomenclatural changes are outlined here.
Because of the limitations of herbarium material available for completing some of the drawings, it was not always possible to represent all the detail of the gynostemium; more detailed notes from field observations were added to the text.
IUCN Red List assessments The conservation status of the new species given in this paper are summaries of the full IUCN Red List assessments which will be completed and submitted for review and publication by IUCN once the species names are validly published and therefore available for assessment. All the assessments have been compiled based on current knowledge of these taxa, using the IUCN Red List Categories and Criteria (2012, 2017). New Species Angraecum archangelicum Hermans & Sieder sp. nov. Type: Madagascar, Fianarantsoa prov., Antoetra, 1727 m, on granite inselberg, 15 Feb. 2015, Sieder, Pertl & Andriantiana, 6871 (WU342015) (holotype WU!). http://www.ipni.org/urn:lsid:ipni.org:names:77211711-1 Pendent to semi-erect epiphytic or lithophytic herb up to 11 cm long. Roots, branched,
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