Flourensia cernua is a species of flowering plant in the aster family known by the English common names American tarwort[2] and tarbush and the Spanish common names hojasé, hojasén, and hoja ancha.

[3][4] Flourensia cernua is a shrub growing from a network of roots that may extend four meters (over 13 feet) horizontally.

[6] Flourensia cernua is winter-deciduous in most regions, but may retain its leaves in areas with sufficient moisture.

Other common plants associated with tarbush include whitethorn acacia, catclaw acacia, honey mesquite, Berlandier wolfberry, mariola, Wright's beebrush, littleleaf sumac, broom snakeweed, winterfat, and smooth-leaf sotol.

In Mexico it is steeped to make a tea that is consumed to treat various gastrointestinal conditions such as indigestion and diarrhea.

[6] It is also used for respiratory disorders; its extracts have shown the ability to kill multidrug-resistant Mycobacterium tuberculosis in vitro.

[10] The leaves and flower heads are sold in farmers' markets in Mexico and the United States.

The fact that it is increasing in abundance in the Chihuahuan Desert has sparked interest in its value as food for local domestic animals.

[3] Compounds isolated from the plant include flavonoids, sesquiterpenoids, monoterpenoids, acetylenes, p-acetophenones, benzopyrans and benzofurans.