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This summary revision of the species of Astragalus in North America, north of Mexico, was initially prepared for inclusion in the Flora North America Project. That publication has been postponed indefinitely, and this paper is being presented now to allow those students of the genus with an updated manuscript to review, and to use prior to appearance of the Flora North America treatment. It differs from the Flora North America format in having bibliographic citations to the synonyms, and the type specimens are cited. The present work treats 354 species; 198 varieties; 552 total taxa. Should the 4 7 species and 9 varieties from Mexico be added the totals would be 401 species and 207 varieties, or a total of 608 taxa, an addition of 54 taxa since the 1964 publication of Barneby. It treats all species known to occur within the area being considered, including those taxa named subsequent to the monumental Atlas of North American Speces of Astragalus (Barneby 1964). A key to the species is provided, infrageneric names are provided and given brief descriptions. Species and infraspecific taxa are described, the latter differentiated by keys within the species. Distributional data is given for each taxon, and short discussions of the taxa are given as appropriate.

Nomenclatural and taxonomic novelties include: Astragalus gracilis var. microlobus (A. Gray) S. L. Welsh, comb. nov.; Astragalus molybdenus var. lackschewitzii (Lavin & Marriott) S. L. Welsh, comb. nov.; Astragalus oophorus var. wilkenii S. L. Welsh, var. nov.; Astragalus sect. Mollissimi A. Gray subsect. Nutriosenses S. L. Welsh, subsect. nov.; and Astragalus sect. Pulsiferani S. L. Welsh, sect. nov.; Astragalus sect. Knightiani S. L. Welsh, sect. nov.; Astragalus sect. Scytocarpi subsect. Microcymbi S. L. Welsh, here validated with a Latin description; Astragalus praelongus var. avonensis (S. L. Welsh & N. D. Atwood) S. L. Welsh, stat. nov.; Astragalus robbinsii var. morganiae S. L. Welsh, var. nov.; Astragalus argophyllus var. alvius S. L. Welsh, var. nov.; Astragalus lentiginosus var. multiracemosus S. L. Welsh & N. D. Atwood, var. nov.; Astragalus lentiginosus var. negundo S. L. Welsh & N. D. Atwood, var. nov.

Table of Contents




Astragalus Linnaeus

Keys I-IX


Excluded Species



Distribution Maps



Publication Date



Marcus E. Jones Endowment Fund, Monte L. Bean Life Science Museum, Brigham Young University, Provo, Utah


Astragalus Linnaeus, cited type specimens, species descriptions, taxa discussion, bibliographic citations, Flora North America



North American Species of Astragalus Linnaeus (Leguminosae): A Taxonomic Revision

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