Members of the grass family are monocots, have parallel veins, and small inconspicuous flowers.

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Big Bluestem, Turkeyfoot Andropogon gerardii This is the tall grass of the tallgrass prairies of Indiana, Illinois, up to and including Eastern Minnesota. I have stood in an acre plot of pure Big Bluestem that was over my head.
	Barnyard Grass Andropogon gerardii This is the tall grass of the tallgrass prairies of Indiana, Illinois, up to and including Eastern Minnesota. I have stood in an acre plot of pure Big Bluestem that was over my head.
Yellow Foxtail
Yellow Nutsedge Cypernus esculentis Wetland plant but will be high as well. The roots form tubers.
Sandbur Sandburs are pretty univeral in sand. You don't want to walk barefoot in an area with sandburs.