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Beach Bur
( Ambrosia chamissonis )
Ambrosia chamissonis
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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7 Nurseries Carry This Plant
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About Beach Bur (Ambrosia chamissonis)
7 Nurseries Carry This Plant
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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
Perennial herb
Size
4 ft tall
7 ft wide
Dormancy
Evergreen
Flower Color
Yellow, Green
Flowering Season
Summer, Fall
Wildlife Supported
Butterflies & moths hosted ( 2
confirmed
, 19
likely
* )
SHOW ALL
Ambrosia Plume Moth
Adaina ambrosiae
Adaina ambrosiae
Gnorimoschema saphirinella
Gnorimoschema saphirinella
*
Hoary Comma
Polygonia gracilis
Polygonia gracilis
*
Common Sootywing
Pholisora catullus
Pholisora catullus
*
Western Tussock Moth
Orgyia vetusta
Orgyia vetusta
*
Armyworm Moth
Mythimna unipuncta
Mythimna unipuncta
*
Virginian Tiger Moth
Spilosoma virginica
Spilosoma virginica
Landscaping Information
Sun
Full Sun
Moisture
Extremely Low, Very Low
Nurseries
Carried by 7
Soil Drainage
Fast
Soil Description
Prefers beach sand
Common uses
Bank Stabilization, Bee Gardens, Butterfly Gardens
Sunset Zones
?
4, 5, 14, 15, 16, 17*, 19, 20, 21, 22*, 23*, 24*
Natural Setting
Site Type
Beaches, dunes
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
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Beach Bur
Ambrosia chamissonis
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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