The species is native to the Indian subcontinent and adjacent regions of Southeast Asia. It ranges from eastward throughout India to Myanmar and Thailand and south to Sri Lanka and southern Pakistan. It is a popular ornamental plant and is also used in herbal medicine. It is both the national tree and national flower of Thailand. It is the state flower of Kerala in India.
The tree has strong and very durable wood, and has been used to construct “Ehela Kanuwa”, a site at Adams Peak, Sri Lanka, which is made of C. fistula (ahala, ehela, or aehaela, ඇහැල in Sinhala) heartwood.
Height : 10–20 m (33–66 ft)
Leaves : 15–60 cm (6–24 in) long
Leaflets : 3-8 pairs, each leaflet 7–21 cm (3–8 in) long and 4–9 cm (1.6–3.5 in) broad.
Flower : pendulous racemes 20–40 cm (8–16 in) long, each flower 4–7 cm (1.6–2.8 in) diameter with five yellow petals of equal size and shape.
Fruit : legume, 30–60 cm (12–24 in) long and 1.5–2.5 cm (0.6–1.0 in) broad, with a pungent odor and containing several seeds.
Edible parts : None
Ayurvedic usage : Constipation, Nervous system disorders, Edema, Rashes, Coughs, Burning sensations in the body, Fevers
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