Cytotype Distribution of Atriplex canescens (Chenopodiaceae) of Southern New Mexico and Adjacent Texas

@article{Dunford1984CytotypeDO,
  title={Cytotype Distribution of Atriplex canescens (Chenopodiaceae) of Southern New Mexico and Adjacent Texas},
  author={Max P. Dunford},
  journal={Southwestern Naturalist},
  year={1984},
  volume={29},
  pages={223}
}
  • M. Dunford
  • Published 30 May 1984
  • Geography, Biology
  • Southwestern Naturalist
-Populations of Atriplex canescens in southern New Mexico and western Texas include diploids (2n = 18), tetraploids (2n = 36), and hexaploids (2n = 54). Tetraploids are the most common and widely distributed cytotype. Diploids are limited to specific areas and hexaploids are rare except in the Rio Grande Valley. Tetraploids occur primarily on finer textured soils on the slopes and mesas. Diploids are found on courser sandy soils and sand dune areas. The hexaploids seem better adapted to the… 
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References

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TLDR
All evidence points to a center of origin for Atriplex in northern Mexico, and the numerous species which have migrated northward into western United States and Canada were apparently able to do so because attributes acquired to make them adaptive in the hot dry deserts of Mexico were characteristics which pre- adapted them for colder climates and alkaline clay soils to the north.
EVOLUTIONARY STUDIES OF ATRIPLEX: A RELIC GIGAS DIPLOID POPULATION OF ATRIPLEX CANESCENS
TLDR
Several lines of evidence suggest that the gigas form is a relic diploid and the normal form is an autotetraploid derived from it.
EVOLUTIONARY STUDIES OF ATRIPLEX: ADAPTIVE PRODUCTS FROM THE NATURAL HYBRID, 6N A. TRIDENTATA x 4N A. CANESCENS
Much of the variation in hexaploid Atriplex tridletntuita appears to have come from tetraploid A. caniescens by introgression. Among the recombinations, three types appear to have become established