Reviewed
Amaranthaceae (Amaranth family)
Broadleaf plant family
In Missouri the amaranths (pigweeds) make up the vast majority of plant genera that occur within this family.
Amaranth, Palmer
Amaranthus palmerii
Pigweed, redroot
Amaranthus retroflexus
Pigweed, smooth
Amaranthus hybridus
Pigweed, tumble
Amaranthus albus
Waterhemp, common
Amaranthus rudis
For an idea of relative seed size, each photo contains a millimeter ruler. The distance between increments is 1 mm.