Cascabela species

Cascabela species;

Flower for ID - 120512 - RK - 2: Request ID of this Flower.Called Karaveera in Kannada.The pic has been taken by my friend Usha Ramaiah in Puttur,Karnataka.Found growing in temple compounds v. often & comes in white too. It's a short tree.Only one picture provided.Pic taken on 28-04-12 at 4pm.
It could be a species of Thevetia of Apocynaceae family.
Thevetia (बिट्टी )