bluegrass: any of various grasses of the genus Poa
grass: narrow-leaved green herbage: grown as lawns; used as pasture for grazing animals; cut and dried as hay
scallop: one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)