Just wanted to post a link, I found this site entirely by accident. It's a guide to aquarium and pond plants of the world, with descriptions and beautiful photos. If you click on 'browse fact sheets', you can select a type of plant and read about it in detail, and on each fact sheet is a 'pictures' link to amazing photographs. Anyone with a plant they're having trouble identifying might want to check this site out
Here's the link
Here's the link