plural in form but singular or plural in construction
: a spring-flowering herb (Dicentra cucullaria) of the fumitory family occurring in the eastern U.S. and having finely divided leaves and cream-white double-spurred flowers
: a delicate spring-flowering herb (Dicentra cucullaria of the family Fumariaceae) that occurs in the eastern United States and has tubers that are a source of corydalis
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