| Periwinkle snails ordinarily live in ecological harmony with salt marshes, eating only dead cordgrass and a fungus that grows on the plants. |
| Along the Atlantic and Gulf coasts of North America, both species feed exclusively on the phloem sap of cordgrass, Spartina alterniflora. |
| Marsh vegetation consists mainly of cattail and sedges, with salt marsh cordgrass occurring along creek banks. |
| In the Rio Grande valley, Texas seaside sparrows were found nesting in black mangroves, saltmeadow cordgrass, and saltwort. |
| The river channel meanders through wide tidal freshwater marshes of cattail and sedges, with stands of saltmarsh cordgrass along the upper banks. |
| Located on a cordgrass marsh, the house rests on random pilings that blend in with the pine grove. |
