The pasque flower (or pasqueflower) was designated the official state flower of South Dakota in 1903. Also called the May Day flower, prairie crocus, wind flower, Easter flower and meadow anemone, the pasque is one of the first flowers to bloom in the spring (often before the late winter snows have thawed).

Pasque is a tallgrass prairie flower and grows wild throughout South Dakota. The pasque flower is member of the buttercup family and is highly toxic (pasque flowers were used as a medicine by native Americans for centuries).