Conocarpus erectus var. sericeus or Silver Buttonwood
The Silver Buttonwood is used here a lot as trees and as hedges. De gray leaves have very fine hairs. Like the Green Buttonwood the flowers are very small and inconspicious. The fruits are inedible little round buttons, hence the name 'Buttonwood'. Once ripe they fall apart releasing the seeds.
The Silver Buttonwood can very well withstand wind and is drought tolerant. The plant lends it self well to be pruned as a hedge as mentioned before.