Common reed is not as productive or beneficial to a salt marsh as cordgrass. The introduction of the strong-growing smooth cordgrass ("Spartina alterniflora") has also had deleterious effects. Salt marsh features Spartina alterniflora (smooth cordgrass) and Spartina patens (marsh hay). It needs native pickleweed, which is often displaced by invasive cordgrass, for its habitat. The introduction of cordgrass caused these habitats to transform into marshlands. These include reed sweetgrass, cordgrass, rice, tomatoes, lupines and algae. Possible plants include reed sweetgrass, cordgrass, rice, tomatoes, lupines and algae. Growing among the dunes are such species as cordgrass, salt-grass, pine trees, purslane and pennywort. An example of a halophyte is the salt marsh grass "Spartina alterniflora" (smooth cordgrass). The wetlands consist of invasive "phragmites", a genus of wild grasses, as well as cordgrass. Originally, smooth cordgrass was the only species that was planted. Saltmeadow cordgrass marshes serve as pollution filters and as buffers against flooding and shoreline erosion. Less visible in "the low marsh" at the margin of the water is smooth cordgrass.