I have a bunch of ceanothus sp, AKA "California Lilacs." Very fragrant...and LOADED with small bumblebees of some species.
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(stock photo stolen from teh intarwebs)
Photo of mine...
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The nurseryman fucked me though...I told him I wanted low growing shrubs...these are 4-5' tall...and growing. I had a "privacy fence" built of lattice framed and attached to 4x4 uprights with the ceanothus planted underneath it. The stuff pushed the lattice out of the framework. So...I'm gonna hack them down and rebuild the privacy fence.