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- a herbaceous plant with bright yellow cup-shaped flowers, common in grassland and as a garden weed. All kinds are poisonous and generally avoided by livestock.
- Genus Ranunculus, family Ranunculaceae (the buttercup family): numerous species, including the very familiar common buttercup (R. acris). This large family also includes anemones, celandines, aconites, clematises, and hellebores, many of which have poisonous seeds