Scientific NameAmaranthus retroflexus
Other Common Names:
This erect summer annual can be found flowering from July through October.
The alternate leaves are ovate with wavy margins. The leaves are hairy on the lower surface, along the prominent veins. The stout, hairy stem can grow up to 6 1/2 feet in height.
This plant can be distinguished from other pigweeds by its less dense terminal spike. The first true leaves of this plant are alternate, unlike any of the other pigweeds.
Flower Seed Head
The small greenish flowers occur in terminal spikes. Smaller spikes of flowers may be found at the leaf axils.
The glossy black seeds each form inside a 2 mm long utricle that splits open at maturity.
This plant can be found in pastures, along roadsides, and other disturbed soils.
upright and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
longer than leaf
Stem Cross Section
round or oval