Cytisus supranubius
Cytisus supranubius (also known as white-flowered broom or retama del Teide) is a species of broom endemic to the Canary Islands. This species is found at about 2000m altitude on Tenerife in Las Cañadas del Teide and on mountain tops on La Palma. Etymology
The species name "supranubius" comes from the Latin "supra", which means "above" and "nubius", which means "clouds", referring to the fact that this species is found at high altitudes on the islands of Tenerife and La Palma, above the height of the so-called "sea of clouds". References

Genisteae
Endemic flora of the Canary Islands
Taxa named by Hermann Christ