Other names: Pineland threeseed mercury
Life cycle: Annual
Found in: Cropland, cultivated areas, roadsides and waste areas primarily in the southeast and eastern U.S., but is migrating to the Midwest.
General description: Erect plant with saw-toothed leaves and spiked flowers.
Seedlings: Cotyledons are hairy and young leaves are noticeably serrated. Sometimes mistaken for prickly sida.
True leaves: Alternate, up to 4" in length, with heavily serrated margins that resemble a saw blade. Leaves occur on long petioles, and there is a distinctive red dot where the leaf and petiole meet.
Flowers and fruit: Flowers grow on spikes and later turn to seedheads.