Cytotaxonomical studies on AsianAnnonaceae |
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| Authors: | Hiroshi Okada Kunihiko Ueda |
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| Institution: | (1) Department of Biology, College of General Education, Osaka University, Toyonaka, 560 Osaka, Japan;(2) Department of Botany, Faculty of Science, Kyoto University, 606 Kyoto, Japan |
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| Abstract: | Chromosome numbers of 42 species and 3 varieties from 24 genera of theAnnonaceae have been determined (Table 1); reports for 15 of the genera are new. Among Asian genera 2n = 14 occurs only in the specializedMezzettia, while 2n = 16 is wide-spread and also has been found inAnaxagorea with some primitive characters. 2n = 18 is reported for 11 genera, and tetraploidy (2n = 36) has been observed inPolyalthia. Therefore, an original basic number of x = 8 or x = 9 is suggested at least for the Asian genera of theAnnonaceae.—Cytotaxonomical notes on the critical speciesPolyalthia rumphii andP. affinis are given, and the new combinationNeouvaria parallelivenia (Boerl.)Okada & Ueda is proposed. |
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| Keywords: | Angiosperms Magnoliales Annonaceae Cytotaxonomy somatic chromosome numbers original basic chromosome number |
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