Pennsylvania sedge at the perimeter of one of multiple ant hills constructed by Formica exsectoides, Allegheny mound ant, a species of Atlantic United States, in pitch pine/scrub oak/huckleberry forest. Even though these
ants are widely distributed, they are infrequent within their large range. Pennsylvania sedge is a myrmecohorous plant (i.e.,
one whose seeds are carried around by ants).