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

american bog asphodel, 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, bog, bog asphodel, bog bilberry, bog candles, bog down, bog hemp, bog kalmia, bog laurel, bog moss, bog myrtle, bog pimpernel, bog plant, bog rein orchid, bog rhubarb, bog rose, bog rosemary, bog soil, bog spavin, bog star, bog whortleberry, bushy aster, calico aster, china aster, common bog rosemary, cornflower aster, crooked-stemmed aster, eastern silvery aster, european bog asphodel, flat-topped white aster, genus aster, golden aster, goldilocks aster, grass-leaved golden aster, hairy golden aster, heart-leaved aster, heath aster, large-leaved aster, late purple aster, maryland golden aster, mojave aster, narrow-leaved white-topped aster, new england aster, new york aster, northern bog lemming, panicled aster, peat bog, perennial salt marsh aster, prairie aster, prairie golden aster, purple-stemmed aster, rough-leaved aster, rush aster, schreiber's aster, sea aster, short's aster, sickleweed golden aster, small white aster, smooth aster, southern aster, southern bog lemming, starved aster, sticky aster, stiff aster, stokes' aster, tansy leaf aster, tradescant's aster, upland white aster, wavy-leaved aster, western silvery aster, white prairie aster, white wood aster, white-topped aster, whorled aster, willow aster, wood aster