Karyology and systematics of the genusAmbavia and otherAnnonaceae from Madagascar |
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| Authors: | Wilfried Morawetz Annick Le Thomas |
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| Institution: | (1) Institut für Botanik und Botanischer Garten, Universität Wien, Rennweg 14, A-1030 Wien, Austria;(2) Laboratoire de Phytomorphologie, EPHE, Muséum, 16 rue Buffon, F-75005 Paris, France |
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| Abstract: | New chromosome counts and nuclei structures are reported forAnnonaceae species from Madagascar:Ambavia (2n = 14),Xylopia (2n = 16) andPolyalthia (2n = 18). This first generic count ofAmbavia and its nucleotypic parameters underline its long term isolation from the African continent and it should be regarded as an extremely distinct member of the basic stock of AfricanAnnonaceae. Some karyological similarities are found with the African generaCleistopholis (2n = 14) andUvariopsis (2n = 16) and the AmericanTetrameranthus (2n = 14, 28). The karyology ofXylopia is completely in line with previous results from the Palaeo- and Neotropics.Polyalthia has 2n = 18, and x = 9, probably the only base number within the whole genus. Fluorochrome and Giemsa-C-band patterns are identical with different congeneric species.Dedicated to Prof. DrElisabeth Tschermak-Woess on the occasion of her 70th birthday. |
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| Keywords: | Angiosperms Magnoliales Annonaceae Ambavia Polyalthia Xylopia Chromosome numbers karyomorphology systematics and evolution in tropical woody plants Flora of Madagascar |
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