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One can pick them out from all the other non-blooming (don't want to say dull!...) clumps of grasses because the grass leaves are like little thin tiny iris leaves for they are in the iris family. Here is more info: http://2bnthewild.com/plants/H192.htm They say "There are many species under the rubric Blue-eyed Grass with only slight details of their form to distinguish them. They are not grasses of course but instead related to the Irises."
Index- plants in this FamilyIridaceae / Iris
I assume it is the Eastern Blue-eyed Grass (Sisyrinchium atlanticum) but will have to measure.