Found this article pointing out 21 species of land plants commonly sold as a aquatics. I've definitely seen a few of them around Edmonton sold as such (not going to name names). Also provides some tips for telling if plants are aquatic.
The technicallity here is that many aquatic plants can be grown out of water as well. This is explained as well.
http://www.practicalfishkeeping.co.uk/content.php?sid=4741