Do you have a picture? BTW the people at Lowe's and Home Depot wouldn't be much help. Find a real nursery to go to or contact your county extension service, there will be a master gardener there to assist you.

I agree--big box garden center personnel don't know anything about gardening or plants, or even prices for that matter.
If you can post a picture, gardenweb has a forum called "Name that Plant" and members there are awesome at IDs. I think they enjoy the challenge. For me, they even ID'd dog vomit fungus! (And I thought it really WAS dog vomit...)
BlueBars

Here is a link that might be useful: http://www.personal.psu.edu/sam21/dogvomit.htm