Wildflowers of Tucson, Arizona
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Xanthium strumarium - Rough Cockleburr (Common Cocklebur) Xanthium strumarium - Rough Cockleburr (Common Cocklebur)
Scientific Name: Xanthium strumarium
Common Name: Rough Cockleburr, Common Cocklebur
Flower Color: Inconspicuous, greenish
Plant Type: Herb, Annual
Height: To 5 feet (1.5 m) tall
Date Observed: October 30, 2004, August 20, 2004
Notes: Poisonous seeds and cotyledons. The male flowers are at the stem tips. The female flowers are in the leaf axils and are followed by spiny, 1.5 inch (3.8 cm) long burs. The dry burs adhere to clothing or fur. The leaves are heart-shaped and coarsely toothed.
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