|water-hemlock (Cicuta maculata)||
water-hemlock (Cicuta maculata; PARSLEY FAMILY [Apiaceae]) Tall (to 6'), HIGHLY POISONOUS perennial from a hollow, tuberous base. Flowers small and white, but made conspicuous by their arrangement in an often incomplete, somewhat rounded, 2-5" wide umbel. Leaves twice or thrice compound. Common and conspicuous plant in ditches, wet openings, and swamps. Flowers in summer and early fall. 
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