bladder campion

(noun) perennial of Arctic Europe having large white flowers with inflated calyx. Synonyms: bladder campion, Silene uniflora, Silene vulgaris.

(noun) bluish-green herb having sticky stems and clusters of large evening-opening white flowers with much-inflated calyx; sometimes placed in genus Lychnis. Synonyms: white campion, evening lychnis, white cockle, bladder campion, Silene latifolia, Lychnis alba.