James·town weed Bot. The poisonous thorn apple or stramonium (Datura stramonium), a rank weed early noticed at Jamestown, Virginia. See Datura.
 Note: ☞ This name is often corrupted into jimson, jimpson, and gympsum.

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 Stra·mo·ni·um n.  Bot. A poisonous plant (Datura Stramonium); stinkweed. See Datura, and Jamestown weed.

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 At·ro·pine n.  Chem. A poisonous, white, crystallizable alkaloid, extracted from the Atropa belladonna, or deadly nightshade, and the Datura Stramonium, or thorn apple. It is remarkable for its power in dilating the pupil of the eye. Called also daturine.

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 Datura stramonium
      n : intensely poisonous tall coarse annual tropical weed having
          rank-smelling foliage, large white or violet
          trumpet-shaped flowers and prickly fruits [syn: jimsonweed,
           jimson weed, Jamestown weed, common thorn apple, {apple
          of Peru]