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Six species of Madagascan Genipa transferred to Hyperacanthus (Rubiaceae-Gardenieae) and new data on general morphology, placentation and ovary structure in Hyperacanthus

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Abstract:

Genipa in Madagascar currently comprises 11 species of Rubiaceae. These species do not belong in the New World genus Genipa (Gardenieae) but instead should be placed in Old World genera belonging to the tribes Gardenieae and Octotropideae. Six species can be confidently placed in the genus Hyperacanthus (Gardenieae), and the appropriate new combinations are made. Five species belong to the tribe Octotropideae but can not be unequivocally placed in genera at the present time and consequently no combinations are proposed. Three new types of placentation are recorded in Hyperacanthus, which broaden the morphological characterization of the genus. These placentation types are apparently unique within Rubiaceae and perhaps even within Asterideae. Species descriptions, additional material examined, distribution, ecology and conservation assessments are given for each of the six new combinations in Hyperacanthus.

Keywords: CONSERVATION; DRAKE DEL CASTILLO; GARDENIEAE; IUCN RED LIST CATEGORIES; MADAGASCAR; OVARY MORPHOLOGY; PLACENTATION; RUBIACEAE

Document Type: Research Article

Affiliations: 1: Parc Botanique et Zoologique de Tsimbazaza, B.P. 4096, Tsimbazaza, Antananarivo, 101, Madagascar 2: The Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE, U.K.

Publication date: May 1, 2006

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