Astragalus darwinianus Gómez-Sosa, a new endemic species (Leguminoseae, Galegeae) from the south of Argentina, is described, illustrated, and compared with the morphologically similar A. patagonicus (Philippi) Spegazzini based on vegetative characteristics and with A. mendocinus Gómez-Sosa based on fruit morphology. The new entity has decumbent stems, racemes that are (2)3- to 4-flowered, and legumes that are unilocular, incurved, and incanous pubescent.
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Vol. 17 • No. 2