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DistributionWolfstail occurs as a native species in the southwestern United States, Mexico, and northern South America [4,36,43,71,75]. In North America, the distribution of wolfstail extends west from southeastern California to western Texas and Oklahoma and north to central Colorado and southern Utah [3,4,28,35]. A disjunct wolfstail population may exist in York County, Maine. This population likely originated from seed in wool from the Southwest [30,35]. Recent reports of wolfstail in Maine are lacking, however . The distribution of wolfstail in North America is presented by the Plants Database.