rush aster(n = noun.plant) - a variety of aster;
is a kind of aster

annual salt-marsh aster, aromatic aster, arrow leaved aster, aster, aster acuminatus, aster arenosus, aster cordifolius, aster divaricatus, aster dumosus, aster ericoides, aster falcatus, aster family, aster linarifolius, aster linosyris, aster macrophyllus, aster novae-angliae, aster novi-belgii, aster ptarmicoides, aster shortii, aster tripolium, aster turbinellis, azure aster, beach aster, benjamin rush, bog aster, bushy aster, calico aster, china aster, common rush, cornflower aster, cotton rush, creeping spike rush, crooked-stemmed aster, eastern silvery aster, egyptian paper rush, flat-topped white aster, genus aster, gold rush, golden aster, goldilocks aster, grass-leaved golden aster, hairy golden aster, hard rush, heart-leaved aster, heath aster, jointed rush, large-leaved aster, late purple aster, maryland golden aster, mojave aster, narrow-leaved white-topped aster, needle rush, needle spike rush, new england aster, new york aster, panicled aster, paper rush, perennial salt marsh aster, prairie aster, prairie golden aster, purple-stemmed aster, rough-leaved aster, rush, rush along, rush away, rush candle, rush family, rush grass, rush hour, rush nut, rush off, rush out, rush rose, salt rush, schreiber's aster, scouring rush, sea aster, short's aster, sickleweed golden aster, slender rush, slender spike rush, small white aster, smooth aster, soft rush, southern aster, spike rush, starved aster, sticky aster, stiff aster, stokes' aster, tansy leaf aster, toad rush, tradescant's aster, upland white aster, variegated scouring rush, wavy-leaved aster, western silvery aster, white prairie aster, white wood aster, white-topped aster, whorled aster, willow aster, wood aster