The place on the map, a freeway exit, is precise because I was making an urban walk through the former course of Temescal Creek in Oakland. I'm no botanist, but blue elderberry would be a native plant for the area. Culverted spaces exist just to the west, that retain the creek's former course and some native flora. Please, if anybody can verify this, it would be exciting, since most of the corridor's native look had been destroyed in the 1960s when the freeway and it's entrances/exits were built.
Blair Park, Piedmont CA
Beautiful Glen Echo Park, Oakland
Within the bounds of Oakland's original 19th century Coast Live Oak grove, this tree may be a descendent. I noted greensettia spotted an oak at 18th and Wood St, not too far from here.
I found the willow past the steps that lead down to the stream. If anybody drops by to take a look, there's a homeless lady who seems to live past the willow. She was afraid of my camera!