It branches profusely once it reaches the surface and forms a dense canopy (Aiken et al. 1979). EWM is monoecious, with seven pink flowers on 5-20 cm (no more than 50 cm) long spikes that extend above ...

EWM was intentionally planted to improve fish habitat in a Tennessee lake around 1953 (Aiken et al. 1979). That population subsequently escaped into the Tennessee River Valley reservoirs resulting in ...