Question
Will peonies and rudbeckia accidentally sprayed with broadleaf weed killer
permanently die or will I just lose this year's plants?  What about large bushes
(forsythia, lilac, fire bush) and trees (white birch, crab apple)?  Will they totally
die or just the branches that got hit?  SOMEONE didn't read the entire label
before he sprayed the yard for weeds with Spectracide.  It's killing me to
watch them die.  I'd rather dig everything up and be done with the torture,
unless there is a chance that they will come back next year.  Please help!

Answer
Spectracide is the name of the company--they do make a herbicide called Weed Stop. If this is what was used it contain a herbicide called 2,4-D which will kill many plants. The annual plants I would say are pretty much gone. The tree species may survive depending on the amount of spray that got on the foliage and the extent of the coverage (whether it was sprayed all over the foliage or just was carried by the wind on some limbs). I would water the trees about every three days or so with 1 inch of water (put a pan under the tree and when the pan has 1 inch in it stop). This will help dilute the concentration in the tree and aid the roots in surviving. The large bushes will depend on the spray coverage, watering may help here also but their chances are less than the trees. Mainly due to the fact they are smaller. If there is still some green on them I would water and try to save them.
Next time follow the label on the herbicide and make sure you do not spray in a wind or when the temperature is high. Lawn herbicides are safe to use IF they are used the way the label says.  

The annuals will not come back they have been killed. The shrubs that the foliage was killed back may sprout back from the root system depending on the dosage of spray they received, the trees should be ok.