Which best describes hydrilla?

Hydrilla is characterized by its leaves that grow in whorls of four to eight around the stem, which is a distinctive feature that helps in identifying this aquatic plant. The structure of the leaves includes visible, coarse teeth along the leaf margin. This specific arrangement and the texture of the leaves allow hydrilla to adapt well to its environment, making it a highly invasive species in many water bodies.

Understanding this morphology is crucial for identification and effective management of hydrilla in aquatic ecosystems. In contrast, other options describe features seen in different aquatic plants or variations, but do not accurately represent the unique characteristics of hydrilla. This distinction is important for those involved in weed control practices as it aids in differentiating hydrilla from other similar species.