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Chromosome numbers and their cyto taxonomic significance for north american astragalus fabaceae



Chromosome numbers and their cyto taxonomic significance for north american astragalus fabaceae



Taxon 25(4): 463-476



This study presents 126 original reports of chromosome numbers for 101 taxa of North American Astragalus; 46 are the 1st records for species. Chromosome numbers are now known from at least 1 count for slightly more than 40% of the North American species; on a world wide basis about 80% of the species are still unknown from a single count. This study supports earlier work demonstrating the basic division between Old World species, including their close New World relatives (x = 8, euploidy common), and strictly New World lineages (x = 11, 12, 13, 14, 15, euploidy rare). Two euploids of New World relationship, A. layneae Greene and A. pictiformis Barneby, are added to the long known A. grayi Parry ex Wats: all are 2n = 44. The number 2n = 30 is reported for the 1st time in New World species, being recorded for A. guatemalensis Hemsl., A. radicans Hornm., A. ervoides H. and A., A. parvus Hemsl., and A. diphacus Wats. All are Mexican species; some are considered primitive, others advanced. The chromosome number 2n = 22 is also reported for primitive species. It is proposed that the New World species originated from a tetraploid of 2n = 32 or a hypotetraploid, evolutionary radiation in some lineages concomitant with descending aneuploidy, in other lineages with little or no change in number.

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Accession: 004952738

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