Sentence:  <WSD>Fritillaries</WSD> are as fundamental a part of the British water meadow landscape as Ratty and Mole slowly punting along under a willow tree. They speak of opalescent spring mornings, with their distinctive chequered bells bowed earthward and beaded with dew, a dark counterpoint to the acid-fresh grass. 
Meaning of the word marked with <WSD> tags:  Any of several bulbous perennial plants, of the genus "(Fritillaria)", having flowers with a spotted or chequered pattern.