IDAHO STATE FLOWER

Syringa 

Mock Orange Philadelphus lewisii 

The Syringa (Philadelphus lewisii) was designated the state flower of Idaho by the legislature in 1931. It is a branching shrub with clusters of white, fragrant flowers. The blossoms are similar to the mock orange, have four petals, and the flowers grow at the ends of short, leafy branches. 

Read more: http://www.50states.com/flower/idaho.htm#.Upfjl8RDu8Y