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Beach Bur
Ambrosia chamissonis
  
About Beach Bur (Ambrosia chamissonis) 5 Nurseries Carry This Plant Ambrosia chamissonis is a species of ragweed known by the common names Silver Burr Ragweed, Silver Beachweed and (Silver) Beach Bur(r). It is known from most of the coastline of western North America from Alaska to Baja California, where it is a resident of beaches and other sandy coastal habitat. This is a large, sprawling perennial herb exceeding three meters in maximum width. The stems are roughly or softly hairy and longitudinally ridged. The plentiful leaves are a few centimeters long, woolly and silver-green, and variable in shape. The plant is monoecious, with male and female flowers on each individual. Staminate (male) flower heads containing many pale colored florets occur at the tip of the flower cluster, with pistillate (female) flower heads clustered below them. Each pistillate head contains a single tiny flower which develops into a fruit. The fruit is a brown bur up to a centimeter wide covered in sharp spines.
Plant Description
Plant Type
Plant Type
Perennial herb

Size
Size
13 ft tall

Flower Color
Flower Color
Yellow, Green

Flowering Season
Flowering Season
Summer

Wildlife Supported
 


 
Butterflies & moths hosted ( 2 confirmed , 19 likely * ) SHOW ALL

Landscaping Information
Sun
Sun
Full Sun

Moisture
Moisture
Extremely Low, Very Low

Nurseries
Nurseries

Soil Drainage
Soil Drainage
Fast

Soil Description
Soil Description
Prefers beach sand

Sunset Zones
Sunset Zones?
4, 5, 14, 15, 16, 17*, 19, 20, 21, 22*, 23*, 24*

Natural Setting
Site Type
Site Type
Beaches, dunes

Climate
Climate
Annual Precipitation: 7.8" - 71.6", Summer Precipitation: 0.14" - 2.06", Coldest Month: 39.9" - 57.6", Hottest Month: 55.6" - 75.8", Humidity: 0.01" - 22.99", Elevation: -2547" - 1789"

Alternative Names
Common Names: Beach-bur, Silver Beachweed, Silver Bur Ragweed, Silver Burr Ragweed


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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