The submersed leaves are about the same size, but are more lance-shaped. Submersed leaves have pointed tips and pointed bases. Illinois pondweed's greenish flowers are on spikes that are one to three inches long. Other Pondweeds T here are about 80 species of pondweeds in the world. They occur in a variety of aquatic habitats.
Some pondweeds are totally submersed, others have floating leaves.
Pondweeds may be relatively large plants, such as Potamogeton illinoensis , and some are small, such as Potamogeton diversifolius . Some have relatively large leaves, such as Potamogeton nodosus , and others have very narrow leaves, such as Potamogeton pusillus and Potamogeton pectinatus . Pondweeds are very important as wildlife food.