- Botany. a collection or rosette of bracts subtending a flower cluster, umbel, or the like.
- a covering, especially a membranous one.
Origin of involucre
1570–80; < Middle French < Latin involūcrum involucrum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for involucre
Large umbel of yellow flowers, no involucre and no involucels.The Medicinal Plants of the Philippines
T. H. Pardo de Tavera
The involucre is simple and leafy, and the receptacle is conical.
Plants with heads of florets on a common receptacle, surrounded by an involucre.
The sporangia are comparatively scanty, and are fully covered by the involucre.Beautiful Ferns
Daniel Cady Eaton
Spikelets in our species umbelled, and the involucre 2–3-leaved.
- a ring of bracts at the base of an inflorescence in such plants as the composites
C16 (in the sense: envelope): from New Latin involucrum, from Latin: wrapper, from involvere to wrap; see involve
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
- 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.