stinking chamomile
Anthemis cotula L

Overview

Appearance

Anthemis cotula is an annual herbaceous plant in the sunflower family (Asteraceae) growing up to 2 ft (0.61 m) in height. The stems are erect, branching and become dark red with age. A. cotula has a fibrous root system along with a taproot. It is native to the Mediterranean but is now found worldwide.

Foliage

A. cotula leaf blades are about 0 .75 - 2.5 in. (1.9-6.35 cm) long and 1 in. (2.54 cm) wide. The first leaves are opposite but become alternate as they ascend up the stem. Leaves are thick, finely dissected, slightly pilose and an unpleasant odor.

Flowers

Flowers of A. cotula are held at the end of branches and are approximately 0.66 in. - 1.33 in. (1.68 - 3.38 cm) in diameter. Ray flowers are white with three distinct teeth and disk flowers are yellow.

Fruit

A. cotula fruits are achenes approximately 0.05 - 0.07 in. (1.2 - 1.8 mm) long.

Ecological Threat

A. cotula is allelopathic, requires control in cropping systems, and may contaminate seed crops, requiring costly seed cleaning. Caution: Contact with A. cotula can cause irritations and rashes to workers and livestock. Milk of dairy animals develops a strong unpleasant flavor after consuming A. cotula.

Resources

• Weed Identification Guide - Virginia Tech

Selected Images

Maps

Invasive Listing Sources

• Colorado Noxious Weeds
• Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
• National Park Service, Mid-Atlantic Exotic Plant Management Team Invasive Plant List
• Nevada Noxious Weeds
• WeedUS - Database of Plants Invading Natural Areas in the United States

References