A. Is either a Pee Gee Hydrangea or Limelight...I'd say it looks more like a Pee Gee.

B. Another Hydrangea ...probably Tardiva or Kyushu.
Both hydrangeas are paniculatas and bloom on "current" years growth, so you can cut them back fairly hard in fall or early spring.

C. Potentilla (prune to shape after flowering)...or cut out old stems to rejuvenate.

D.Looks like Summer Wine Ninebark

E. Spirea...can take severe pruning if required.

F. Looks like a Black eyed Susan.....

Ian

I was puttering around the flower bed, dealing with drought stricken shrubs, and found a plastic label that said "Pee Gee Hydrangea". So, you were right on, ians_gardner! Is Pee Gee Hydrangea also a "paniculata"?

Is Pee Gee Hydrangea also a "paniculata"?

Yes. Blooms on new wood and is hardy and is fairly drought tolerant. Prune at will, especially in early spring, so as to stimulate more new wood and more blooms later in the summer.