Nagalingam Flower/Couroupita guianensis/Ayahuma /Cannonball Tree.
This tree is a commonly seen in countries like south America,Caribean and India.
The Cannonball Tree was given its species name Couroupita guianensis by the French botanist J.F. Aublet in the year1755.
In Shiva temples in India u can see many of them. In Hindi it is called Shiv Kamal and Nagalingam tree in Tamil. In Bengali, it is called Nagkeshar. The flowers are called Shivalinga flowers in Hindi; Nagalinga Pushpa in Kannada; Nagamalli flowers or Mallikarjuna flowers in Telugu. Hindus revere it as a sacred tree because the petals of the flower resemble the hood of the Naga, a sacred snake, protecting a Shiva Lingam, the stigma.
Info Courtesy : Wiki