Visually, the fennel pondweed differs from the other species: its stems are very branchy, and the thin leaves are as narrow as threads. It grows in shoals, and the flexible stems coil and wave in the slowest of streams. The thickets of pondweeds hide schools of fry. These plants are fully submerged; only when flowering, the spikes rise above the water to be pollinated by the wind.
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