Trisha Shetty (Editor)

Ambrosia chamissonis

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Kingdom  Plantae
Subfamily  Heliantheae
Scientific name  Ambrosia chamissonis
Rank  Species
Order  Asterales
Genus  Ambrosia
Higher classification  Ragweed
Ambrosia chamissonis Wildflowers NPS SAMO NRA Ambrosia chamissonis detail page
Similar  Baccharis sphaerocephala, Baccharis rhomboidalis, Daisy family, Chaetanthera, Baccharis concava

Ambrosia chamissonis is a species of ragweed known by the common names silver burr ragweed, silver beachweed and (silver) beach bur(r).

Ambrosia chamissonis Ambrosia chamissonis Asteraceae image 11937 at PlantSystematicsorg

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 habitats.

Ambrosia chamissonis httpsuploadwikimediaorgwikipediacommonsthu

Description

Ambrosia chamissonis Ambrosia chamissonis Wildflowers in Santa Barbara

Ambrosia chamissonis is a large, sprawling perennial herb exceeding 3 metres (9.8 ft) 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.

Ambrosia chamissonis Ambrosia chamissonis silver burweed Wildflowers of the Pacific

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 inflorescence, 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.

Ambrosia chamissonis Ambrosia chamissonis Wildflowers in Santa Barbara

References

Ambrosia chamissonis Wikipedia


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