Brooms are a group of shrubs introduced into North America from Europe in the mid-1800s. The four most common species are Scotch broom (Cytisus scoparius), French broom (Genista monspessulana), Spanish broom (Spartium junceum), and Portuguese broom (Cytisus striatus).

Cal-IPM Broom

UC IPM Pest Note - Brooms

UC Weed Research and Information Center

California Invasive Plant Council