The flower of the cassia fistula tree is the national flower of Thailand. This flower is known in Thai as ratchaphruek, is bright yellow in color and is referred to as the royal flower.
The cassia fistula tree's flowers form thick clusters while developing and are so plentiful that they cover the branches. Due to its appearance, this tree is also known as the golden shower tree. The pods from the tree are used in traditional medicines. The wood of the cassia fistula is particularly strong and solid, and it is used in buildings, mainly as pillars or poles. This tree is native to tropical Asia, Central and South America, and Australia.