Source : Webster's Revised Unabridged Dictionary (1913)

Notchweed \Notch"weed`\, n. (Bot.)
   A foul-smelling weed, the stinking goosefoot ({Chenopodium
   Vulvaria}).

Source : WordNet®

Chenopodium vulvaria
     n : European goosefoot with strong-scented foliage; adventive in
         eastern North America [syn: {stinking goosefoot}]