Scientific NameAmaranthus palmeri
Other Common Names:
This erect summer annual can be found flowering from June through October. Germination occurs from April through September.
The alternately arranged leaves are lance to egg shaped and occur on long petioles. The leaves can be from 2 to 8 inches in length and 1/2 to 2 1/2 inches in length. The undersides of the leaves have prominent white veins. There is one central stem from which many side branches will arise. The central stem can reach 6 1/2 feet in height.
This plant can be distinguished from other pigweeds by its long narrow terminal spike. Another identifying feature is the lack of hair on the leaves.
Flower Seed Head
The small green flowers occur on a terminal spike up to 1 1/2 feet in length. Smaller spikes of flowers can be found on the stem above some leaf petioles. The male and female flowers are found on different plants.
The seeds develop in a utricle that can grow up to 2 mm in length. Each utricle contains one glossy black seed.
This plant can be found infesting croplands.
upright and nonwoody
Thorns or Spines
Approximate Flower Diameter
Dominant Flower Color
longer than leaf
Stem Cross Section
round or oval