Coefficient of Conservatism:
Coefficient of Wetness:
Lakes and streams, at depths up to 5 m or more.
Potamogeton strictifolius tends to have more rigid, revolute, deeper (almost olive) green leaves than does P. friesii, but no clear distinction can be made on these characters. Leaves of plants otherwise clearly P. friesii may have revolute margins, although they are typically flat. The two species as here treated are usually easily separable although some specimens present difficulties. Potamogeton ×haynesii Hellq. & G. E. Crow (P. ×longiligulatus of Michigan Flora) appears to be a hybrid of P. strictifolius with P. zosteriformis and is of scattered occurrence in the state.