Source : Webster's Revised Unabridged Dictionary (1913)

Bractlet \Bract"let\, n. [Bract + -let] (Bot.)
   A bract on the stalk of a single flower, which is itself on a
   main stalk that support several flowers. --Gray.

Source : WordNet®

bractlet
     n : a small bract [syn: {bracteole}]