Katuray flowers are rarely found in Manila markets. If you want to purchase them for your salad or as a side dish, you would have to go to the provinces such as Bulacan, Pangasinan, and Ilocos. Or perhaps at some weekend organic market.
These flowers are also called Hummingbird Tree /Corkwood Tree or Wisteria Tree flowers. Since they resemble petite birds alit on the tree i think it would be best to go by Hummingbird Tree flowers. If i had a big yard i would have this planted in it. Not only is its flowers edible, its roots, bark, and leaves are all useful.
So if perchance you find these edible blooms, go make yourself a salade fleur. It may relieve you of your headache, cough and colds.