More neighborhood plant identification

I've always wondered what the Latin name of these lovely yellow flowers are. Turns out its Oenothera fruticosa. They are also known as sundrops, buttercups, Missouri primroses, and it doesn't matter what you call them, they add a lot of cheer and sunshine to our gardens. They do best in sun, but they add some nice yellow punch to my shady spots, too. I got mine from the always-generous Anne Fitzpatrick... thanks Anne!

Around the corner, on 56th Place, there is a beautiful blue-purple flowering groundcover that does well in rocky soil and sun... it climbs up the stairs of several houses on the eastern side of the street, and blooms in late spring. It may be Campanula 'Birch Hybrid'. They're just gorgeous, I can't wait to try it in my garden!