Lamb's Quarters or Pigweed
Lamb's Quarters or Pigweed
Chenopodium album
Goosefoot Family - Chenopodiaceae
A rather unattractive herb with terminal clusters of non-descript, tiny, green to reddish-green flowers, which lack petals.
  Pathology Images Inc. 2000 to 2002
Leaves alternate, coarsely toothed, whitish below and triangular to roughly diamond-shaped (1 to 4 inches long).
(Photographed - September)