cicuta virosa
Webster's Dictionary (GCIDE)
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. [1913 Webster]
The murmuring pines and the hemlocks.— Longfellow.[1913 Webster]
3.The wood or timber of the hemlock tree. [1913 Webster]
Ground hemlock, or Dwarf hemlock. See under Ground. [1913 Webster]
Water hemlock \Wa"ter hem"lock\ (Bot) (a) A poisonous umbelliferous plant (Cicuta virosa) of Europe; also, any one of several plants of that genus. (b) A poisonous plant ([OE]nanthe crocata) resembling the above. [1913 Webster]
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]