Woolly Fruit Bur Ragweed Ambrosia Eriocentra

Woolly fruit bur ragweed Ambrosia eriocentra

Description

Native to parts of California, Nevada, and

Arizona. One of several Ragweed species whose pollen causes severe hay fever and allergies.

Has the ability to withstand very high surface temperatures for extended periods.

Habit

Rounded shrub reaching over 4.9 ft. tall.

Leaves

Grayish-green to white in color, lanceolate, margins irregularly lobed and toothed, short leaf stalk or petiole (sub-sessile).

Stems

Grayish-brown in color, woolly becoming smooth with age.

Flowers

Source: MISIN. 2021. Midwest Invasive Species Information Network. Michigan State University - Applied Spatial Ecology and Technical Services Laboratory. Available online at https://www.misin.msu.edu/facts/detail.php?id=415. Greenish, inconspicuous, male and single flowered female flowers are pistillate, monecious on flowering stalk.

Fruits and Seeds

Green burr with long, silky white hairs, several hair-tufted sharp spines, 1 cm. long, seed is an achene.

Habitat

Native to western North America. Can be found growing in the plains and mountain ridges up to 5,600 ft in elevation.

Reproduction

By seed.

Similar

Monitoring and Rapid Response

Credits

The information provided in this factsheet was gathered from Flora of North America - eFloras and

Southwest Desert Flora. Individual species images that appear with a number in a black box are courtesy of the Bugwood.org network (http://www.invasive.org). Individual photo author credits may not be included due to the small display size of the images and subsequent difficulty of reading the provided text. All other images appear courtesy of Google (http://images.google.com).