Which invasive aquatic plant has inconspicuous flowers and grows in whorls of leaves?

The correct answer is Parrotfeather, an invasive aquatic plant known for its growth habit, which features whorls of leaves that are arranged around the stem. Parrotfeather can often be identified by its feathery, green foliage, and it typically has inconspicuous flowers that can be easily overlooked, contributing to its stealthy spread in aquatic environments.

This plant thrives in various freshwater bodies and can rapidly colonize areas, outcompeting native species for resources. Its ability to form dense mats can lead to significant ecological impacts, such as altering water flow and diminishing habitats for native aquatic organisms.

Understanding the characteristics of Parrotfeather is important for effective management strategies, as early identification and control can prevent further spread of this invasive species in Florida's waters. The other options, while also related to aquatic plants, have distinctive flowers or growth arrangements that help differentiate them from Parrotfeather.