This is Washingtonia robusta, also known as Skyduster, Mexican fan palm, and Mexican washingtonia. Growing to about 80 feet tall, this tree has some of the most beautiful fans of any palm tree. This tree may live in excess of 500 years in age. The flowers on this tree, and other palms, serve as a larval host for the Palm Flower Moth. USDA Hardiness Zones 9 to 11