|Dichromena latifolia or Rhynchospora latifolia, identified by Andrew Greller.|
Sedges and grasses are wind pollinated and have no showy flowers. It is interesting that Narrow-Leaf White-topped Sedge evolved to attract pollinators and created a sort of flower for this purpose. The apparent petals are not the same as those of a real flower but modified leaves called bracts.
See: Plant Profiles. White Top Sedge