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Plant Database

Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.

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Ambrosia acanthicarpa

Ambrosia acanthicarpa Hook.

Flatspine Bur Ragweed, Annual Burweed, Annual Bursage, Hooker's Bur Ragweed, Western Sand-bur

Asteraceae (Aster Family)

Synonym(s): Franseria acanthicarpa, Gaertneria acanthicarpa

USDA Symbol: AMAC2

USDA Native Status: L48 (N), CAN (N)


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Plant Characteristics

Duration: Annual
Habit: Herb
Size Notes: Up to about 3 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.

Bloom Information

Bloom Color: White , Yellow , Green
Bloom Time: Apr , May , Jun , Jul , Aug , Sep , Oct , Nov
Bloom Notes: Flowers are inconspicuous and without ray florets.


USA: AZ , CA , CO , ID , KS , MN , MO , MT , ND , NE , NM , NV , OK , OR , SD , TX , UT , WA , WY
Canada: AB , MB , SK

Web Reference

Webref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.

Additional resources

USDA: Find Ambrosia acanthicarpa in USDA Plants
FNA: Find Ambrosia acanthicarpa in the Flora of North America (if available)
Google: Search Google for Ambrosia acanthicarpa


Record Modified: 2018-12-11
Research By: CBR

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