Anemonoides oregana

Anemonoides oregana (commonly called "Anemone oregana") is a species of flowering plant in the buttercup family known by the common names blue windflower, Oregon anemone, and western wood anemone. It is native to the forests of Washington, Oregon, and northern California in western North America, generally below elevation.
Taxonomy.
The Oregon anemone was first formally named by Asa Gray in 1887. It has sometimes been treated as a subspecies or variety of "A. nemorosa" or "A. quinquefolia".
Two varieties are sometimes accepted: 
, Kew's Plants of the World Online accepts no infraspecific taxa of "Anemonoides oregana".
Description.
"Anemone oregana" is a perennial herb growing from a thick rhizome, generally high, but exceptionally to . A single basal leaf made up of three large leaflets on a petiole may be present. The inflorescence consists of a single tier of three leaflike bracts and a single flower. The bracts are similar to the basal leaf when the latter is present. The terminal leaflet may have a petiole or may be sessile. Its margin is sharply toothed on the distal half or third and its tip is pointed. Lateral leaflets may have a single lobe. The flower has no petals but 5 to 7 petal-like sepals in any of several colors, usually blue or purple but sometimes reddish, pink, white, or bicolored. In the center of the flower are up to 75 thin stamens. The fruit is a cluster of achenes. 