Flowers are very attractive. Each pea-like flower is off white, and very fragrant.
Bark is very deeply furrowed and a wonderful contrast, especially in winter with snow. Not around here anyway.
Misidentification: not sure, students usually have a problem with so many pinnately compound leaves.
Locations: Great ones on Branciforte and Goss, old school ones.
Lots of cultivars abound as well,
There is a 'Decaisneana' with very light pink flowers at 7341 Soquel Dr on the side of the lot. Shown below. Most likely a hybrid Robinia X ambigua.
'Tortuosa' - A dwarf twisted form, this plant may be 10' tall with a dense twisted branches. Two nice ones on Monterey Blvd in Capitola, 729 and 230 Junipero Ct (2 doors up).