Webster’s Revised Unabridged Dictionary · 1913
Jamestown weed
James′town′ weed′ (·toun′ wēd′). (Bot.) The poisonous thorn apple or stramonium (Datura stramonium), a rank weed early noticed at Jamestown, Virginia. See Datura.
☞ This name is often corrupted into jimson, jimpson, and gympsum.