Abstract
Chloroplast DNA restriction site variation was surveyed in 58 accessions of aneuploid (n = 11-15) North American Astragalus plus outgroup taxa consisting of Oxytropis lambertii, and two species from euploid (n = 8, 16 . . .), predominantly Old World, sections of Astragalus. A set of 52 site mutations was analyzed using Wagner parsimony. The resulting strict consensus tree revealed that the North American aneuploid series forms a monophyletic ingroup relative to the Old World euploid outgroups. In addition, a diverse assemblage of taxa comprising some 20% of the North American species is monophyletic. A method for characterizing large sets of equally parsimonious trees in terms of the diversity of distinct component clades is described and applied to these data.
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