The Collaborative International Dictionary of English v.0.48:

Bracteole \Brac"te*ole\, n. [L. bracteola, dim. of bractea. See
   Bractea.] (Bot.)
   Same as Bractlet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bracteole
    n 1: a small bract [syn: bracteole, bractlet]