Which aquatic plant is known to differ as an annual that overwinter as seed?

Naiads are a group of submerged aquatic plants that can indeed function as annuals, surviving through their seeds during the winter months. This adaptation allows them to thrive in various aquatic environments, especially in temperate regions where seasonal changes affect the survival of many aquatic plants. By overwintering as seeds, Naiads can germinate in the spring, rapidly establishing themselves and taking advantage of the favorable growing conditions, which is critical for their lifecycle.

This ability to reproduce and persist in seed form allows Naiads to occupy ecological niches where other plants might not survive the colder months. Therefore, when we consider their life cycle, the characteristic of overwintering as seeds sets them apart from some other aquatic plants that may either perish during winter or have different means of seasonal survival.