Which of the three major garden systems in the world is not included?

The world garden system is divided into three major systems: European garden system, Western Asia garden system and China garden system, excluding American gardens.

The oriental garden system, represented by China, has influenced Japan, South Korea and Southeast Asia, and is dominated by natural gardens with elegant and exquisite artistic conception. The garden system in West Asia, represented by Iraq and Persia, also known as the Arabian Forest System, has influenced the Middle East, mainly gardens and churches, and formed the garden characteristics of Islam.