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Annual Bursage
Ambrosia acanthicarpa
  
About Annual Bursage (Ambrosia acanthicarpa) 2 Nurseries Carry This Plant Ambrosia acanthicarpa is a species of ragweed known by the common names flatspine burr ragweed, annual burrweed, and annual bur-sage. This spiny, weedy plant grows in clumps of many erect stems which may reach over a meter in height. Its gray-green stems are covered in a coat of stiff, bristly hairs. The few rough leaves are several centimeters long. The racemes of flowers are more plentiful, with each hairy flower head a few millimeters wide. The spiny, burr-like pistillate heads have pointed, twisting leafs and the staminate heads are rounded. This ragweed is native to western North America. It is adaptable and grows well in disturbed areas, easily becoming weedy.
Plant Description
Plant Type
Plant Type
Annual herb

Size
Size
3.3 - 5 ft tall

Flower Color
Flower Color
Cream

Flowering Season
Flowering Season
Summer, Fall

Wildlife Supported
 


Landscaping Information
Sun
Sun
Full Sun, Part Shade

Moisture
Moisture
Very Low

Nurseries
Nurseries

Ease of Care
Ease of Care
Moderately Easy

Soil Drainage
Soil Drainage
Fast

Natural Setting
Site Type
Site Type
Sandy plains

Climate
Climate
Annual Precipitation: 3.0" - 51.7", Summer Precipitation: 0.12" - 2.58", Coldest Month: 25.8" - 59.2", Hottest Month: 53.6" - 88.8", Humidity: 0.65" - 39.49", Elevation: -15" - 8086"

Alternative Names
Common Names: Annual Bur-sage, Annual Burrweed, Bursage Ragweed, Flat-spine Burr-ragweed, Flatspine Bur Ragweed, Flatspine Burr Ragweed, Sand 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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