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Related to Involucre: raceme, pappus


Bracts forming one or more whorls at the base of an inflorescence or fruit in certain plants.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the small, tightly packed apical leaves that surround an inflorescence. In plants of the families Compositae and Dipsacaceae, the involucre closely surrounds the inflorescence; as a result, the involucre and the inflorescence appear to form a single flower. In plants of the family Umbelliferae, the involucre is located at the base of the inflorescences, or compound umbels. The leaves at the base of a simple umbel form an involucel. The morphological characteristics of involucres and involucels are used in the taxonomy of the various families.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Capitulescences monocephalous, terminal or axillar; capitula sessile on the brachyblasts, homogamous, ligulate, five- to seven-flowered; receptacle epaleate; involucre uniseriate, phyllaries ca.
Capitulescences monocephalous, terminal; capitula short-pedunculate, homogamous, discoid; receptacle epaleate; involucre multiseriate.
Capitulescences monocephalous or in cymes, terminal; capitula short-petiolate, homogamous, discoid; receptacle epaleate, alveolate; involucre multiseriate.