Lewis’ Mock Orange, a native species, has been added to the USWildflowers database (06/18/2010.)  Scientific name is Philadelphus lewisii.  This plant also is known by the common names Indian Arrowhead and Syringa.  Syringa is the state wildflower of Idaho.  Photo below was taken Boise National Forest near Horseshoe Bend, Idaho on 06/17/2010.

Lewis’ Mock Orange – Philadelphus lewisii