One hundred and eight new chromosome counts are reported for theSolidago spathulatandash;glutinosacomplex: 49 diploids (2nensp;=ensp;18) and 59 tetraploids (2nensp;=ensp;36). Only diploids are known inS.spathulata, which occurs along the Pacific coast from southern California to northern Oregon. Diploids, tetraploids, and one hexaploid are known inS.glutinosa, which occurs across North America.Solidago glutinosassp.glutinosais composed of diploids only and is widespread in the Rocky Mountains from Mexico to Alaska and across the Canadian prairies. It also occurs disjunctly on the northern shores of Lake Superior and Lake Huron and farther east on the Gaspeacute; Peninsula in Quebec.Solidago glutinosassp.glutinosavar.chlorolepiswas found to be diploid (first report). Tetraploids ofS.glutinosassp.randiiwere found in scattered locations in northeastern North America and around most of the upper Great Lakes, where they occur sympatrically with diploid populations of ssp.glutinosa. A single hexaploid population of ssp.randiiwas reported previously from West Virginia; no hexaploids were encountered in this study.
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