Geranium richardsonii Fisch. & Trautv., Index Seminum (LE) 4: 37 1838. (syn: Geranium albiflorum Hook. [Illegitimate]; Geranium hookerianum Walp.; Geranium loloense H.St.John; Geranium pentagynum Engelm.; Geranium richardsonii var. intermedium Kuntze);
It is native to western North America from Alaska to New Mexico, where it can be found in a number of habitats, especially mountains and forests.
This is a perennial herb varying in maximum height from 20 to 80 centimeters. The plant grows from a tough, woody taproot and older plants develop rhizomes. The leaves are up to 15 centimeters wide and are divided into generally five segments, each segment subdivided into small rounded or pointed lobes. The flower has five pointed sepals beneath five rounded petals, each one to two centimeters long. The petals are white to purple with darker purple veining. The fruit has a small body with a straight style up to 2.5 centimeters long (Ref. Wikipedia– 10.3.13);
Sharing some pictures of Richardson Geranium observed in Yellowstone National Park USA