Hydrilla verticillata
 

Hydrilla  has infested the Wacissa for some time, over to Tobey's right is examples of the weed's impact on open fresh water in Florida.

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Hydrilla verticillata is a submersed freshwater herb which, as an invasive non-native weed, often forms dense stands from the bottom to the top of the water, sprawling across the surface, although it may also be found as detached drifting mats. Hydrilla once was cultured and sold as an aquarium plant.