WordNet (r) 3.0 (2006):

family Asteraceae
    n 1: plants with heads composed of many florets: aster; daisy;
         dandelion; goldenrod; marigold; lettuces; ragweed;
         sunflower; thistle; zinnia [syn: Compositae, family
         Compositae, Asteraceae, family Asteraceae, aster
         family]