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Ambrosia eriocentra
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Woolly Bur-sage
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Ambrosia eriocentra

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About Woolly Bur-sage (Ambrosia eriocentra) Ambrosia eriocentra is a North American species of ragweed known by the common names woolly bursage and woollyfruit burr ragweed. It is native to the southwestern United States (California, Arizona, Nevada, Utah), where it grows in the deserts and surrounding ridges up to about 1700 meters in elevation. Ambrosia eriocentra is a rounded shrub reaching over 1. 5 meters in height. The stems are brownish gray in color, with young twigs coated in light woolly fibers and older branches bare. Leaves are lance-shaped and up to 9 centimeters long, not counting the winged petioles. The leaves have rolled lobed or toothed edges. As in other ragweeds, the inflorescence has a few staminate (male) flower heads next to several single-flowered pistillate heads. The fruit is a green burr with long, silky white hairs and several hair-tufted sharp spines. The burr is around a centimeter long.
Plant Description
Plant Type

Max. Height
4.9 ft (1.5 m)

Native Status

Natural Setting
Elevation ?
-196' - 7763'

Annual Precip. ?
3.0" - 18.0"

Summer Precip. ?
0.41" - 3.11"

Coldest Month ?
39.3° F - 59.5° F

Hottest Month ?
61.8° F - 89.1° F

Humidity ?
3.18 vpd - 43.38 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Woollyfruit Burr Ragweed, Woolly Fruit Bur Ragweed, Woolly Bursage

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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