Bay Grasses Identification Key
Finely Divided Leaves
Carefully count the number of leaves in each whorl on the stem in 2 or 3 places and then choose from the following:
Eurasian Watermilfoil
Most of the whorls have 4 leaves.
Low Watermilfoil
Leaves don't start from exact same location on stem; difficult to count.
Parrot Feather
Most of the whorls have 5 leaves.
If you don't think your plant is represented above, try going and choosing again.