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slough grass, n 
1 Any of var often coarse grasses, or occas other similar plants, that grow in a slough or similar area; often used for hay, hence n slough hay. chiefly Upper Midwest, Upper Mississippi Valley, Plains States
2 Spec:
a A muhly (grass) (here: Muhlenbergia mexicana or M. racemosa).
b also slough sedge: Any of several sedges B1; see quots.
d A grass (Beckmannia syzigachne) found throughout much of the northern and western US, used for forage and for hay.
Also called rattlesnake grass 3
e A cordgrass, usu Spartina pectinata.