[Buckbrush, Deerbrush, Snowbrush and Tea Trees: The Genus Ceanothus West of the Cascade Mountains]
Blue Blossum, Wild Lilac
Ceanothus thyrsiflorus
Blue blossum as seen in bloom at the author's yard in Gresham, OR where it is a large ornamental shrub. It blooms there in early to mid June.
Paul Slichter