[Wikipedia] Canary Islands native: Cytisus proliferus, tagasaste or tree lucerne, is a small spreading evergreen tree that grows 3 - 4 m (10 - 13 ft) high. It is a well known fertilizer tree. It is a member of the Fabaceae (pea) family[3] and is indigenous to the dry volcanic slopes of the Canary Islands,[4] but it is now grown in Australia, New Zealand and many other parts of the world as a fodder crop. (link added by Mary Ann Machi)

[Cal-IPC] Invasive: Cytisus proliferus (tagasaste) is a shrub (family Fabaceae) with white flowers and oval-shaped leaves found in the San Francisco Bay area and south coast ranges of California. It is native to the Canary Islands. It occurs in dunes and grasslands. Its seeds spread via ants, birds, slashing, dumped garden waste and machinery. It also resprouts after fire. Cal-IPC Rating: Watch (link added by Mary Ann Machi)