any of several ranunculaceous plants of the genus Cimicifuga, esp C. foetida of Europe, whose flowers are reputed to repel insects
bugbane in American English
(ˈbʌgˌbeɪn)
noun
any of a genus (Cimicifuga) of perennial plants of the buttercup family, with long spikes of small white flowers whose offensive odor is supposed to repel insects