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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
States.
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Mayweed Chamomile: Anthemis cotula
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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
States.
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| 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
hairs. 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. |
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Stems: Erect, branching, usually
without hairs. 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. |  |
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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. |