Silverleaf Phacelia, a native species, has been added to the USWildflowers database (09/04/2010.)  Scientific name is Phacelia hastata.  Other common names are Timberline Phacelia, Mountain Phacelia.  Photo below was taken in the Boise National Forest near Boise, Idaho on June 7, 2010.

Silverleaf Phacelia, Mountain Phacelia - Phacelia hastata