Real aquatic plants?

[Adarra]

So far the only 'aquatic plants' that I can place are two types of lilies and several types of trees that aren't really aquatic but instead are found near/around water (mangrove trees for instance). I would absolutely love to get some real aquatic plants to liven up the underwater habitats without having to place baobab trees or other plants underwater(!) to try and create a more realistic environment. It would also be a good idea to not have these true aquatic plants count towards an animal's need for foliage/cover, because if you want to create a good-looking underwater environment you'd need more than a few plants for that.