Which of the following is a submersed weed with floating leaves?

American Pondweed is a submersed aquatic plant characterized by its long stem and broad, flat floating leaves. This particular plant can grow fully submerged but also has leaves that can drift to the surface of the water. Its structure allows it to photosynthesize effectively, utilizing sunlight that penetrates the water.

In the context of the other choices, Waterhyacinth is primarily a floating plant, known for its large, buoyant leaves that float freely on the surface, while Duckweed consists of small, free-floating leaves. Egeria, on the other hand, is primarily submersed and does not develop floating leaves like American Pondweed. Thus, the distinguishing feature of submersed weeds that also exhibit floating leaves aligns specifically with American Pondweed.