Melaleuca. There is a labeled public collection in Arcadia called Los Angeles State and County Arboretum where you could also learn names of locally encountered trees, if interested.
I'll go one step further and suggest Melaleuca quinquenervia (via City of Los Angeles Street Trees) Again, an invasive in Florida: Melaleuca quinquenervia via Univ. of Florida's Center for Aquatic and Invasive Plants
I should also mention that jimmyq's suggestion of Callistemon isn't far off. Check out The Callistemon Page (in particular the link to Callistemon and Melaleuca relationships).