From 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.
{Anemone">This genus is now merged in {Anemone. Some species, as
Anemone Pulsatilla, Anemone pratensis, and Anemone
patens, are used medicinally.
[1913 Webster]