Spanish Broom (Spartium junceum, syn. Genista juncea), also known as Weaver’s Broom, is a perennial, leguminous shrub native to the Mediterranean region in southern Europe, southwest Asia and northwest Africa, where it is found in sunny sites, usually on dry, sandy soils. It is the sole species in the genus Spartium, but is closely related to the other brooms in the genera Cytisus and Genista.
This plant has the most fragrant flower I have ever observed. You can smell it from over 100 feet away. Spanish Broom can be found mostly between 2000 ft. and 5000 ft. range in the San Gabriel Mountains. I usually pass by it off the Angeles Crest Highway.