I'm not a plant expert but it looks like a type of fern.... theres a couple aquarium ferns I know that but theres also house plants too. I have java and java moss in my aquarium. Try typing aquarium fern in Google maybe it will pop up. And wait for other more expert at this then me.
I had that problem with petsmart I but monograss (think that's the name) researched it to find out its not an aquatic plant and that it will die and cause issue with water quality so I threw it out $9.00 down the tubes
I am new to having live plants and try and be careful now after also making a few mistakes like buying a plant that only the roots are suppose to go into the water the leaves stay out. I wasn't told that when I bought it. My LFS has lots of plants but most of the clerks have no clue what they are. The local Petco is better and has a fish/plant expert but even he has given me wrong info. Best to do your own research first. Take a picture of the plant and research it on the net before buying.