Mayweed Chamomile: Anthemis cotula
|Weed Description: 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
|Seedling: Stems below the cotyledons
(hypocotyls) are green and become maroon with age. 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
Leaves: Alternate, finely dissected, approximately 3/4 to 2 1/2 inches long and 1 inch wide. Leaves emit an unpleasant odor and may have some short hairs.
|Stems: Erect, branching, usually
Roots: Taproot and fibrous root system.
Fruit: An achene that is approximately 1.2 to 1.8 mm long.
|Flowers: Occur in solitary heads at the ends of branches. Flowers are approximately 2/3 to 1 1/3 inches in diameter and are white (ray flowers) with yellow centers (disk flowers). White ray flowers have 3 distinct teeth.|
|Identifying Characteristics: Plants with finely dissected leaves that emit an unpleasant odor and have white flowers with a yellow center. Mayweed chamomile may resemble Dogfennel (Eupatorium capillifolium) when in the seedling stage, however dogfennel seedlings have petiolated cotyledons and hairy stems. Pineapple-weed (Matricaria matricarioides) also has similar characteristics, but has green flowers and emits a pineapple-like odor when crushed.|