Ketaki, known as umbrella tree or screw pine or keura in Hindi, is barred from the worship of Lord Shiva. It is not offered during pujas and worship as it is cursed by Lord Shiva. There is an interesting story mentioned in the Puranas that explains why Ketaki Flower is forbidden. Once Lord Brahma and Lord Vishnu got it into a fight over who is supreme. To sort out the issue Lord Shiva made His first appearance in the form of Jyotirlinga or Lingodabhavamurti (a column of fire with no end or beginning) before Lord Vishnu and Lord Brahma. Lord Shiva intervened in the fight and said whoever can find out the origin or end of the Shivling is superior.