Other names: Annual, low or short ragweed, Roman wormwood
Life cycle: Summer annual
Found in: Throughout the U.S.
General description: Erect branched plant with small green flowers that produce abundant pollen.
It is a primary cause of hay fever.
Seedlings: Cotyledons are oblong with purple undersides. Hypocotyls are green with purple spots.
True leaves: Alternate, egg-shaped and hairy on the upper surface and margin.
Flowers and fruit: Flowers are small, green and occur on slender inverted stems at the ends of branches. Fruit is woody, dry, yellow-brown to red-brown and shaped like a crown.
Special note: Exhibits glyphosate resistance.