The island is very arid, and vegetation consists of salt bushes, prickly pear cacti and palo santo trees.
From the en.wikipedia.org
Opuntia cactus, spiny acacias and palo santo trees have taken root amid the hardened lava of the lowlands.
From the time.com
They are composed of shrubs, thorny trees, carrob trees, faique trees, huayacan trees, hualtaco trees, palo santo trees, ceibo trees and on the coast mangrove forests.