Winter or summer annual with finely dissected leaves that may reach 2 feet in height. Primarily a weed of landscapes, nursery, and some agronomic crops that is found throughout the United States. Cotyledons are thick and smooth, approximately 7 to 8 mm long. The first true leaves are opposite, but all subsequent leaves are alternate.
All true leaves are thick and finely dissected with some short hairs.
Leaves emit an unpleasant odor and may have some short hairs. Erect, branching, usually without hairs. Taproot and fibrous root system. An achene that is approximately 1.2 to 1.8 mm long. Occur in solitary heads at the ends of branches.