Which of the following is a native aquatic plant problematic in Florida?

Hydrilla is considered a problematic aquatic plant in Florida despite being native to the southeastern United States. Its aggressive growth can lead to significant issues in natural ecosystems and managed water bodies. Hydrilla can quickly form dense mats that can obstruct waterways, impact aquatic habitats, and reduce biodiversity by outcompeting native flora. Furthermore, its rapid growth can interfere with recreational activities, such as boating and fishing, and can alter the chemical and physical properties of water bodies, contributing to problems with dissolved oxygen levels and water quality.

In contrast, while the other options consist of native aquatic plants that play beneficial roles in their ecosystems, they do not proliferate to the extent that Hydrilla does. This highlights the unique nature of Hydrilla as an invasive species that disrupts aquatic environments in Florida, necessitating management strategies to control its spread.