Karen, I find plants at big box stores (especially Home Depot Garden center) are often mislabeled. One of the clerks said that shoppers take the plastic labels out of the pots to read them and then place them back in the wrong plant but a few years ago a manager from a commercial nursery told me that most of their workers are non english speaking and place the tags in the wrong plants all the time but they are supposed to be checked before leaving the nursery. I think it's probably a combination of both.
Thank goodness for our Plant ID Forum:
http://garden.org/forums/view/... here at ATP and such wonderful members helping each other out! We have a few members who are very knowledgeable and awesome at identifying plants and have helped me numerous times!