Answer: baneberry

AnswerCrossword Clue
baneberryA plant of the buttercup family that bears fluffy spikes of creamy-white flowers followed by shiny berries. Native to north temperate regions, it was formerly used in medicine
baneberryThe bitter, typically poisonous berry of this plant
baneberrya black poisonous berry, the fruit of the plant Actaea spicata