Not just for Alabama residents, this guide produced by Alabama DNR is worth using wherever you live in the Southeast.  A no-nonsense, straight forward vocabulary approach to identifying aquatic plants.

Follow the link to begin identifying your aquatic weed problem.  The guide is conveniently broken down into emergent, submersed, floating-leaved, floating, filamentous, and planktonic categories for an easier start to your search.

This one is worth bookmarking and with all its pictures, an amateur should be on the easy track to pinpointing his or her pond weed problem.