nightshade

from WordNet (r) 3.0 (2006)

nightshade
    n 1: any of numerous shrubs or herbs or vines of the genus
         Solanum; most are poisonous though many bear edible fruit

from The Collaborative International Dictionary of English v.0.48

Nightshade \Night"shade`\, n. [AS. nichtscadu.] (Bot.)
   A common name of many species of the genus {Solanum}, given
   esp. to the {Solanum nigrum}, or black nightshade, a low,
   branching weed with small white flowers and black berries
   reputed to be poisonous.
   [1913 Webster]

   {Deadly nightshade}. Same as {Belladonna}
   (a) .

   {Enchanter's nightshade}. See under {Enchanter}.

   {Stinking nightshade}. See {Henbane}.

   {Three-leaved nightshade}. See {Trillium}.
      [1913 Webster]