Japanese Barberry (Berberis thunbergii) may be a noxious invasive, but it came here because it was beautiful, and no one can take that away from it.
The former State Office Building, now (like everything else) luxury apartments, with the fall colors of Gateway Plaza in front. At lower right, a yellow-vested man is working on the garden in the median of Liberty Avenue.
Staghorn Sumac (Rhus typhina) has some of the most spectacular fall colors of all the spectacular trees nature plants for us around here. This clump was growing just below Grandview Avenue, Mount Washington, where they clung to the side of the hill. It should not be confused with the notoriously unwelcome Tree of Heaven or Chinese Sumac, also called Pittsburgh Palm or Tree from Hell, whose leaves just turn sickly yellow and fall off.