bracteole

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A small bract.

Century Dictionary and Cyclopedia

1. n. In botany, a little bract situated on a partial flower-stalk or pedicel, between the bract and the calyx, and usually smaller than the true bract. Also called bractlet. See cut under bract.

Wiktionary

1. n. A small leaf of leaf-like structure directly subtending a flower or inflorescence whose stalk itself is subtended by a bract.
2. n. A bract subtending an individual flower rather than an inflorescence.

GNU Webster's 1913

1. n. Same as bractlet.

WordNet 3.0

1. n. a small bract