Potamogeton illinoensis

Native to Florida

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Illinois pondweed is a common submersed plant. Illinois pondweed grows equally well in shallow ponds, lakes, and slow-movieng rivers from the peninsula west to the central panhandle of Florida (Wunderlin, 2003). It blooms from spring to fall.

Illinois pondweed has two primary leaf shapes: the floating leaves are more-or-less elliptic in shape, and are much longer than they are wide; typically to eight inches long. The leaves are on long leaf stems or "petioles". 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.