pasqueflower

[pask-flou-er] /ˈpæskˌflaʊ ər/
noun
1.
an Old World plant, Anemone pulsatilla, of the buttercup family, having purple, crocuslike flowers blooming about Easter.
2.
a related plant, A. patens, having similar flowers: the state flower of South Dakota.
Origin
Pasque (variant spelling of Pasch) + flower (so named by the herbalist Gerarde in 1597); replacing passeflower < Middle French passefleur; see pass
British Dictionary definitions for pasqueflower

pasqueflower

/ˈpɑːskˌflaʊə; ˈpæsk-/
noun
1.
a purple-flowered herbaceous ranunculaceous plant, Anemone pulsatilla (or Pulsatilla vulgaris), of N and Central Europe and W Asia
2.
any of several related North American plants, such as A. patens
Symbol paschal flower, pulsatilla
Word Origin
C16: from French passefleur, from passer to excel + fleur flower; changed to pasqueflower Easter flower, because it blooms at Easter