Ambrosia cordifolia, called the Tucson bur ragweed,[3] is a North American species of plant in the family Asteraceae.

It is native to northern Mexico (Sonora, Sinaloa, San Luis Potosí, Guanajuato, Baja California Sur) and the State of Arizona in the United States.

[4][5][6] Ambrosia cordifolia is a shrub up to 50 cm (20 inches) tall.

Flower heads are small and inconspicuous, as the plant is wind-pollinated.

The heads develop into spiny burs as the seeds ripen.