Hordeum pusillum, the little barley, is an annual grass native to the United States (except the westernmost parts). It arrived via multiple long-distance dispersals of a southern South American species of Hordeum about one million years ago. Its closest relatives are therefore not the other North American taxa like meadow barley (Hordeum brachyantherum) or foxtail barley (also known as squirreltail grass, H. jubatum), but rather Hordeum species of the pampas of central Argentina and Uruguay. It ...
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