The Collaborative International Dictionary of English v.0.48:

Stinkweed \Stink"weed`\, n. (Bot.)
   Stramonium. See Jamestown weed, and Datura.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stinkweed
    n 1: foetid Eurasian weed having round flat pods; naturalized
         throughout North America [syn: field pennycress, French
         weed, fanweed, penny grass, stinkweed, mithridate
         mustard, Thlaspi arvense]