Cicuta maculata

from The Collaborative International Dictionary of English v.0.48

Hemlock \Hem"lock\, n. [OE. hemeluc, humloc, AS. hemlic,
   hymlic.]
   1. (Bot.) The name of several poisonous umbelliferous herbs
      having finely cut leaves and small white flowers, as the
      {Cicuta maculata}, {Cicuta bulbifera}, and {Cicuta
      virosa}, and the {Conium maculatum}. See {Conium}.
      [1913 Webster]

   Note: The potion of hemlock administered to Socrates is by
         some thought to have been a decoction of {Cicuta
         virosa}, or water hemlock, by others, of {Conium
         maculatum}.
         [1913 Webster]

   2. (Bot.) An evergreen tree common in North America ({Abies
      Canadensis} or {Tsuga Canadensis}); hemlock spruce.
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            The murmuring pines and the hemlocks. --Longfellow.
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   3. The wood or timber of the hemlock tree.
      [1913 Webster]

   {Ground hemlock}, or {Dwarf hemlock}. See under {Ground}.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Musquash \Mus"quash\, n. [American Indian name.] (Zool.)
   See {Muskrat}.
   [1913 Webster]

   {Musquash root} (Bot.), an umbelliferous plant ({Cicuta
      maculata}), having a poisonous root. See {Water hemlock}.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Cowbane \Cow"bane`\ (kou"b[=a]n`), n. (Bot.)
   A poisonous umbelliferous plant; in England, the {Cicuta
   virosa}; in the United States, the {Cicuta maculata} and the
   {Archemora rigida}. See {Water hemlock}.
   [1913 Webster]