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Genetic analyses of Astragalus sect. Humillimi data in the southwest USA


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Massatti, R.T., 2018, Genetic analyses of Astragalus sect. Humillimi data in the southwest USA: U.S. Geological Survey data release,


These data were compiled to support effective conservation for species within Astragalus sect. Humillimi. Two species, A. cremnophylax var. cremnophylax and A. humillimus are federally listed as endangered taxa. The data provided herein were used to resolve the relationaships among taxa, the population structure within taxa, and genetic diversity within taxa. The data are provided in a STRUCTURE-formatted file that includes taxa, individuals, sampling localities, and the genotype scores per individual for 690 Amplified Fragment Length Polymorphisms (AFLPs).


Point of Contact :
Robert T Massatti
Originator :
Robert T Massatti
Metadata Contact :
Robert T Massatti
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Southwest Biological Science Center
USGS Mission Area :

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The purpose of these data are to resolve the relationships among several closely related Astragalus species, as well as to determine the genetic diversity and population structure within species. Clarifying the taxonomy has implications regarding the management of two species: Astragalus cremnophylax var. cremnophylax and Astragalus humillimus. Regarding A. c. var. cremnophylax, it is unknown whether populations on the North Rim and South Rim and the Grand Canyon should be treated as the same species, or if the North Rim population is better treated independently.


The authors of these data request that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.



  • USGS Data Release Products
  • USGS Southwest Biological Science Center (SBSC)



Additional Information


Type Scheme Key
DOI doi:10.5066/P9KJT37B

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