WordNet (r) 3.0 (2006):

Eustoma grandiflorum
    n 1: one of the most handsome prairie wildflowers having large
         erect bell-shaped bluish flowers; of moist places in
         prairies and fields from eastern Colorado and Nebraska
         south to New Mexico and Texas [syn: prairie gentian,
         tulip gentian, bluebell, Eustoma grandiflorum]