These, and such undeveloping leaves, wherever they occur, are called "bracts" by botanists, a good word, from the Latin "bractea," meaning a piece of metal plate, so thin as to crackle. They seem always a little stiff, like bad parchment, - born to come to nothing - a sort of infinitesimal fairy-lawyer's deed.
Proserpina: Studies of Wayside Flowers (Volume 2), Part VII, Chapter I (p. 16)