The Collaborative International Dictionary of English v.0.48:

Pulsatilla \Pul`sa*til"la\, n. [NL.] (Bot.)
   A genus of ranunculaceous herbs including the pasque flower.
   This genus is now merged in Anemone. Some species, as
   Anemone Pulsatilla, Anemone pratensis, and Anemone
   patens, are used medicinally.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Anemone pulsatilla
    n 1: European perennial having usually violet or white spring
         flowers [syn: European pasqueflower, Pulsatilla
         vulgaris, Anemone pulsatilla]