Carried by 0 nurseries
View Availability at NurseryData provided by the participants of the Consortium of California Herbaria
View additional distribution information on the Jepson eflora
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.
Annual herb
3 - 5 ft Tall
Cream
Summer, Fall
Full Sun, Partial Shade
Very Low
Moderate
Fast
Sandy plains
Coastal Sage Scrub, Foothill Woodland, Valley Grassland
Butterflies and moths supported
1 confirmed and 21 likely
Ambrosia Plume Moth
Adaina ambrosiae
Garden Webworm Moth
Achyra rantalis