Potamogeton
illinoensis
Illinois pondweed
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.
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