WordNet (r) 3.0 (2006):

common unicorn plant
    n 1: annual of southern United States to Mexico having large
         whitish or yellowish flowers mottled with purple and a long
         curving beak [syn: common unicorn plant, devil's claw,
         common devil's claw, elephant-tusk, proboscis flower,
         ram's horn, Proboscidea louisianica]