Cytoevolutionary patterns inRutaceae |
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| Authors: | H M Stace J A Armstrong S H James |
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| Institution: | (1) Botany Department, The University of Western Australia, 6009 Nedlands, WA, Australia;(2) Department of Conservation and Land Management, Western Australian Herbarium, PO Box 104, 6152 Como, WA, Australia |
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| Abstract: | Chromosome numbers for 9 tribes and 73 genera ofRutaceae are examined for the probable chromosome base numbers in these taxa. There is abundant dysploidy and infrageneric polyploidy in the largeRutoideae/Toddalioideae complex. We found that x = 18 was typical for the tribesZanthoxyleae andToddalieae; probably ancestral in theBoronieae and perhaps in theRuteae, Diosmieae, andCusparieae; and characteristic of subfamilyFlindersioideae. Considering the basic position of elements ofZanthoxyleae andToddalieae in the family it appears that diploid x = 18 is ancestral in theRutaceae. The morphologically advancedCitroideae are invariant for x = 9 and may be a product of dysploid reduction. |
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| Keywords: | Angiosperms Rutaceae Cytoevolution chromosome base numbers dysploidy polyploidy cladistics gondwanan forests heathlands |
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