Fraxinus dipetala
Deciduous shrub or small tree growing to 20’ or greater. The serrated leaves are 2-8” long, light to dark green, with 3 to 7 leaflets 1-3” long. White flowers hang in clusters and are sweetly scented. The fruit is a long, flat samara.
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https://calscape.org/loc-California/Fraxinus dipetala (California Ash)?newsearch=1