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]

The Collaborative International Dictionary of English v.0.48:

Henbane \Hen"bane`\, n. [Hen + bane.] (Bot.)
   A plant of the genus Hyoscyamus (Hyoscyamus niger). All
   parts of the plant are poisonous, and the leaves are used for
   the same purposes as belladonna. It is poisonous to domestic
   fowls; whence the name. Called also, stinking nightshade,
   from the fetid odor of the plant. See Hyoscyamus.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stinking nightshade
    n 1: poisonous fetid Old World herb having sticky hairy leaves
         and yellow-brown flowers; yields hyoscyamine and
         scopolamine [syn: henbane, black henbane, stinking
         nightshade, Hyoscyamus niger]