Abstract
About 200 specimens of petrified wood, predominantly root wood, from an Upper Miocene locality near Grover, Weld County, Colorado, were studied. Ten dicotyledons were distinguished, but it was possible to assign only three to an extant genus and/or family. They are Salix pawneensis sp. nov., Maloidoxylon coloradoense sp. nov., and M. galbreathii sp. nov. This represents the first description of fossil wood of Salix from the western United States. These petrified woods corroborate earlier determination of the presence of the Rosaceae and Salicaceae in the Late Tertiary of the High Plains.
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