Physical 

S. alterniflora is a smooth grass that averages from 3 to 6 feet in height.  S. patens is smaller, ranging from 12 to 18 inches.  Flowers and fruits are located on only one side of the stalk in both plants.

Habitat

S. alterniflora is found in the low marsh areas along the bay, while S. patens thrives on the high marsh.  The roots of S. alterniflora  help to keep the banks of its habitat held together.  S. patens is usually found with spikegrass.

Feeding 

Canada geese consume S. alternifloras rootstalks as a major part of there winter diet along the shore.  The seeds of both grasses are eaten by marsh birds.  Many small estuarine animals feed off of the detritus from the decaying grasses.