Cassia fistula

Cassia fistula, also known as golden shower, purging cassia, Indian laburnum, Kani Konna, or pudding-pipe tree, is a flowering plant in the family Fabaceae. The species is native to the Indian subcontinent and adjacent regions of Southeast Asia. It is the official state flower of Kerala state in India. It is also a popular ornamental plant and is also used in herbal medicine.

Source: Wikipedia