WordNet (r) 3.0 (2006):

American pulsatilla
    n 1: short hairy perennial with early spring blue-violet or
         lilac flowers; North America and Siberia [syn: American
         pasqueflower, Eastern pasque flower, wild crocus,
         lion's beard, prairie anemone, blue tulip, American
         pulsatilla, Pulsatilla patens, Anemone ludoviciana]