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Annals of Botany 79: 283-290, 1997
© 1997 Annals of Botany Company

Cytoevolution, Phylogeny and Taxonomy in Epacridaceae

HELEN M. STACE, ALEX R. CHAPMAN, KRISTINA L. LEMSON and JOCELYN M. POWELL

Department of Botany, The University of Western Australia, Nedlands, WA, 6907, Australia Western Australian Herbarium, Department of Conservation and Land Management, PO Box 104, Como, WA, 6152, Australia Hawkesbury-Nepean Catchment Management Trust, PO Box 556, Windsor, NSW, 2756, Australia

Received February 3, 1995 ; Accepted September 16, 1996

Chromosome numbers in Epacridaceae were collated from various authors and superimposed on to recent cladograms for the family. The results strongly indicate that reduction in chromosome number occurs with evolutionary advancement. Thus Epacridaceae, in common with ‘Ericaceaesens. strict .’ and ‘Vacciniaceaesens. strict. ’, has evolved from a primitive karyotype of at leastx =12 and probablyx =13. This conclusion dispels earlier paleopolyploid models based on a primitivex =6 in the family. Other aspects of cytoevolution, such as chromosome number as a generic character especially in cytologically advanced genera of the Styphelieae, are discussed.

Cytoevolution; cladistic models; primitive character states for chromosome number; dysploid falls; cytotaxonomy; Epacridaceae; Richeoideae; Epacridoideae; Epacrideae; Styphelieae; Ericaceae


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