ISSN:
1615-6110
Keywords:
Asteridae
;
Polemoniaceae
;
18S rDNA sequences
;
systematics
;
phylogenetics
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Cladistic analyses of chloroplast DNA disagree with current classifications by placingPolemoniaceae near sympetalous families with two staminal whorls, includingFouquieriaceae andDiapensiaceae, rather than near sympetalous families with a single staminal whorl, such asHydrophyllaceae andConvolvulaceae. To explore further the affinities ofPolemoniaceae, we sequenced 18S ribosomal DNA for eight genera ofPolemoniaceae and 31 families representing a broadly definedAsteridae. The distribution of variation in these sequences suggest some sites are hypervariable and multiple hits at these sites have obscured much of the hierarchical structure present in the data. Nevertheless, parsimony, least-squares minimum evolution, and maximum likelihood methods all support a monophyleticPolemoniaceae that is placed nearFouquieriaceae, Diapensiaceae and related “ericalean” families.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00985732
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