One variety of this plant, the Wenatchee Mountains checkermallow (Sidalcea oregana var. calva), is a rare taxon endemic to the Wenatchee Mountains of Washington.
According to Peakbagger.com the Wenatchee Mountains are defined as bounded by U.S. Route 2 from Stevens Pass to Wenatchee on the Columbia River, then down the Columbia River to Interstate 90, then west along the highway to the vicinity of Cle Elum and Roslyn, then north along Cle Elum Lake and the Cle Elum River and north to Stevens Pass.
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It is endemic to central Washington state in the United States, where it occurs in the Wenatchee Mountains in Chelan and Kittitas Counties.