Botany. a collection or rosette of bracts subtending a flower cluster, umbel, or the like.
a covering, especially a membranous one.
- in·vo·lu·cral, adjective
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How to use involucre in a sentence
Its flower-heads are surrounded by a spreading foliaceous woolly involucre, and its foliage is also of the same woolly character.The New Gresham Encyclopedia | Various
The margin is continuously recurved to form a rather broad involucre, and the very edge is somewhat thinner and whiter.Beautiful Ferns | Daniel Cady Eaton
The upper part of the veinlets is covered with sporangia, which as they ripen push out from beneath the involucre.Beautiful Ferns | Daniel Cady Eaton
Around and beneath each yellow cluster are two rows of thin, green, smooth scales (involucre).Seed Dispersal | William J. Beal
This beetle ordinarily lays its eggs in the involucre of the butternut.Northern Nut Growers Association Report of the Proceedings at the Second Annual Meeting | Northern Nut Growers Association
British Dictionary definitions for involucre
a ring of bracts at the base of an inflorescence in such plants as the composites
- involucral, adjective
- involucrate, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for involucre
A series of bracts beneath or around a flower or flower cluster. The cupule, the cuplike structure holding an oak acorn, is a modified, woody involucre.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.