RHH's photos with the keyword: henderson's checker mallow

If I have this identified correctly, it is a rather rare wildflower found only in Oregon, Washington and British Columbia. I stand to be corrected, however on the ID. The botanical name for the species is Sidlacea hendersonii and it is found in wetlands and coastal areas. ronaldhanko-orchidhunter.blogspot.com/2012/07/oregon-coast.html