in·vo·lu·cre 
(ĭn′və-lkər)
(ĭn′və-lkər)n.
A group of one or more whorls of bracts beneath a flower or flower cluster.
[French, from Latin involūcrum, wrapper, envelope; see INVOLUCRUM.]
in′vo·lucral (-krəl), in′vo·lucrate (-krĭt, -krāt′) adj.
involucre