San Diego County, California, US
the flower was not more than 1/2" across, possibly less
Oregon checkerbloom or Bog mallow covers less than 1 % of TMEA site 10
Sidalcea is a genus of the botanical family Malvaceae. It contains several species of flower known generally as checkerblooms or checkermallows, or prairie mallows in the United Kingdom. They can be annuals or perennials, some rhizomatous. They are native to West and Central North America.