Which aquatic plant is considered weedy and has an underground rhizome for reproduction?

The spatterdock is recognized as a weedy aquatic plant that features an underground rhizome to facilitate its reproduction. This characteristic of having a rhizome allows the plant to spread and establish itself in various aquatic environments, often leading to dense colonies that can outcompete other native species.

Spatterdock, typically found in ponds and marshes, can create significant ecological impacts due to its rapid growth and ability to dominate in certain conditions. Its rhizomatic growth strategy enables it to survive adverse conditions and extend its reach in aquatic habitats effectively.

In contrast, other options like water lily and lotus are also aquatic plants known for their beauty and ecological value but are not typically classified as weedy plants. Cattails, while prevalent in wetlands, primarily reproduce through seed dispersal rather than extensive rhizome networks like that of spatterdock. These distinctions help highlight the unique weedy nature of spatterdock in aquatic ecosystems.