Additions to the genus Barleria in Madagascar
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Summary. Three new species of Barleria L. (Acanthaceae) are described from the Antsiranana region of northern Madagascar: B. speciosa I. Darbysh., B. glandulostamina I. Darbysh. and B. microcalyx I. Darbysh. Two subspecies are recognised in the second of these, subsp. glandulostamina and subsp. pseudohumilis I. Darbysh. The sectional placement and species affinities of each of the new species are discussed and the conservation status of each taxon is assessed: all are considered to be globally threatened.
Key WordsAcanthaceae Antsiranana conservation IUCN Red List assessment new species
The authors would particularly like to thank Dr Laurent Gautier of the Conservatoire et Jardin Botanique de la Ville de Genève for kindly providing useful information on the new species and their localities, and for permitting use of the photographs of each of the new species taken by P. Ranirison. ID is also most grateful to Thomas Daniel of the Dept. of Botany at the California Academy of Sciences for providing duplicate material of his excellent Malagasy Barleria collections, and Mats Thulin of Uppsala University for providing duplicate material and photographs of Barleria humilis from western Madagascar. Andrew Brown is thanked for providing the detailed illustrations.
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