Two varieties of Oregon anemone or blue windflower are recognized in the Flora of North America: variety felix, with 60-75 stamens, is found in sphagnum bogs west of the Cascades in Washington and Oregon, while variety oregana (with 30-60 stamens) has a broader distribution, extending east across the Cascades and south into California. The latter variety is a species of “shaded, moist woods, open hillsides” (FNA), and indeed this is where I encountered it for the first time at the end of May, growing in a second-growth coniferous forest with an Acer circinatum understorey, with abundant Trillium ovatum and an occasional Prosartes. For those familiar with Gifford Pinchot National Forest, this was along the access road to the Guler Ice Caves.
Quoting from the Flora of North America, the etymology of the name Anemone is not definitively known. It is “probably Greek anemos, wind”, but also “possibly from Naaman, Semitic name for Adonis, whose blood, according to myth, produced Anemone coronaria“.