Other names: Common cocklebur, rough cocklebur
Life cycle: Summer annual
Found in: Cropland and pastures throughout the U.S.
General description: Upright, branched plant with speckled stems.
Seedlings: Cotyledons are thick, waxy and ovate. Hypocotyls are purple at the base.
True leaves: First true leaves are opposite, but all others are alternate. Feel like sandpaper and are triangular with serrated edges.
Flowers and fruit: Flowers are encased within a bur, which is egg-shaped, brown and bristly with two long beaks projecting from the tip. Each bur holds two seeds. One has a short dormancy period and
the other can stay dormant for up to several years.