Grau-Erle
This grass occurs in moist habitat types such as riverbanks, sand bars, and woodlands, often alongside willow species ("Salix" spp.). It is also associated with prickly rose ("Rosa acicularis"), western river alder ("Alnus incana"), highbush cranberry ("Viburnum edule"), raspberry ("Rubus idaeus"), northern bedstraw ("Galium boreale"), alpine bluegrass ("Poa alpina"), common fireweed ("Epilobium angustifolium"), Tilesius wormwood ("Artemisia tilesii"), and rough bentgrass ("Agrostis scabra").