White cedar may refer to several different trees:
Bignoniaceae
Tabebuia heterophylla - native to Caribbean islands and also cultivated as an ornamental tree
Cupressaceae:
Chamaecyparis thyoides – Atlantic white cypress
Cupressus lusitanica – Mexican white cedar
Thuja occidentalis – Eastern arborvitae
Meliaceae:
Melia azedarach – Chinaberry, commonly referred to as white cedar in Australia