cuckoo flower

(noun) a bitter cress of Europe and America. Synonyms: lady's smock, cuckooflower, cuckoo flower, meadow cress, Cardamine pratensis.

(noun) common perennial native to Europe and western Asia having usually pink flowers with ragged petals. Synonyms: ragged robin, cuckoo flower, Lychnis flos-cuculi, Lychins floscuculi.