I saw  Naga Linga tree with beautiful flowers and fruits at Tiru Aavinkudi temple in Palani. This tree is sacred and flowers of this tree are used for worshipping the Gods. It has a heady fragrance too. But the nice pink flowers are really attractive. The petals are very thick and are arranged in circular pattern. The core of the flower resembles a linga and it has a  small hood like petal above this. Hence the name Nagalinga. This is also known as the Canon ball tree as the fruits resemble the canon balls. The botanical name Couroupita guianensis.