What is the name of the only submersed weed that does not have roots?

Coontail is identified as the only submersed weed that does not have true roots. This aquatic plant has a unique structure that allows it to anchor itself in the sediment through its submerged stems rather than through traditional root systems. Instead of roots, coontail utilizes branched stems that can absorb nutrients directly from the water.

Understanding that coontail does not rely on roots helps highlight its adaptability in aquatic environments and differentiates it from other aquatic plants. For example, waterhyacinth, duckweed, and American lotus all possess either floating or submerged root structures that serve vital functions such as nutrient uptake and stabilization within their habitats. Thus, recognizing coontail as the exception emphasizes its unique biological characteristics among aquatic vegetation.