A wild orchid with modified leaves is what a Bracted Orchid (Habenaria viridis var. bracteata) is. Specifically, modified leaves are called bracts. They grow in and very close to a plant's flower. They tend to overshadow the flower in color and size.
The national flower of Singapore is a hybrid orchid, named Vanda Miss Joaquim. It was first discovered by Agnes Joaquim, hence the name for the orchid. It was choosen and announced as Singapore's National Flower on 15 April 1981.