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Deux nouvelles espèces du genre Aeranthes Lindl. de l'Est de Madagascar, Aeranthes rhytophora Ramandimbisoa & Verlynde, sp. nov. et Aeranthes rhopalastra Ramandimbisoa & Verlynde, sp. nov. sont décrites, illustrées et comparées aux espèces proches du genre. Aeranthes rhytophora sp. nov. est proche de Aeranthes nidus Schltr., mais en diffère par son inflorescence plus longue, un rachis fractiflexe et des fleurs présentant un éperon tubulaire à l'apex arrondi. Aeranthes rhopalastra sp. nov. est proche de Aeranthes parvula Schltr., mais en diffère par sa plus grande taille (23-25 vs 8-14 cm), un labelle à bords finement denticulés, cordé-auriculé à la base puis largement ovale, l'éperon cylindro-conique et une colonne plus longue avec un rostelle aux dents courtes et obtuses. La distribution, l'écologie et le statut de conservation de ces deux espèces sont brièvement analysés.
Contribution to the study of Malagasy Orchidaceae. XL. Two new species for the genus Aeranthes Lindl. Two new species of the genus Aeranthes Lindl. from the East of Madagascar, Aeranthes rhytophora Ramandimbisoa & Verlynde, sp. nov. and Aeranthes rhopalastra Ramandimbisoa & Verlynde, sp. nov. are described, illustrated and compared with other closely related species within the genus. Aeranthes rhytophora sp. nov. appears to be related to Aeranthes nidus Schltr. but differs from it by its longer inflorescence, a fractiflex rachis and flowers bearing a tubular spur with a rounded tip. Aeranthes rhopalastra sp. nov. is close to Aeranthes parvula Schltr. but is distinct from it by its larger size (23-25 vs 8-14 cm), its finely denticulated lip edges, cordate-auriculate at the base then largely oval, its cylindric-conical spur and longer column with a rostellum bearing short and obtuse teeth. The distribution, ecology, and conservation status of these two species are briefly analyzed.
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