Which invasive floating plant has larger fronds and fused hairs on the upper leaf surfaces?

The giant water fern, known scientifically as Salvinia molesta, is recognized for its unique characteristics, which include larger fronds compared to other floating plants. Additionally, its upper leaf surfaces are covered with fused hairs that give them a distinctive appearance and enhance their ability to float. These features help differentiate it from similar plants in aquatic environments.

Unlike the water fern or mosquito fern, the giant water fern's larger fronds and specific hair structure are key identifiers. Southern watergrass, while related to aquatic vegetation, does not share the floating characteristics and leaf structure of the giant water fern. This distinction makes the giant water fern easily recognizable in the context of invasive aquatic plants.