bracteole
noun
brac·te·ole ˈbrak-tē-ˌōl 
: a small bract especially on a floral axis
Example Sentences
Recent Examples on the Web On either side of their orchid-like faces grow whisker-thin leaves called bracteoles that extend up to a foot long. 
Kathryn O’shea-evans, WSJ, 25 Oct. 2017
Kathryn O’shea-evans, WSJ, 25 Oct. 2017 Word History
Etymology
New Latin bracteola, from Latin, diminutive of bractea
First Known Use
1812, in the meaning defined above