Other names: Pennsylvania knotweed, pinweed
Life cycle: Summer annual
Found in: Cropland throughout the U.S.
General description: Plant with branched reddish stems and small clustered flowers that can grow up to 3½ feet high.
Seedlings: Cotyledons are elliptic or lanceolate with hairy edges.
True leaves: Alternate, lanceolate or elliptic and 2" to 6" long. Often have a purple spot in the middle.
Flowers and fruit: Flowers are clustered in spikes at the ends of stems. They are usually pink but can also be white. Fruit is black, dry and one-seeded.