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Related to involucral: bracteole


, pl.


(in'vō-lū'krŭm, -loo'kră),
1. An enveloping membrane, for example, a sheath or sac.
2. The sheath of new bone that forms around a sequestrum.
Synonym(s): involucre
[L. a wrapper, fr. in-volvo, to roll up]
Farlex Partner Medical Dictionary © Farlex 2012


, involucrum (ĭn′vō-lū″kĕr) (ĭn″vō-lū′krŭm) [″ + volvere, to wrap]
1. A sheath or covering.
2. The covering of newly formed bone enveloping the sequestrum in infection of the bone.
Medical Dictionary, © 2009 Farlex and Partners


  1. a calyx-like structure formed by bracts below the base of a condensed INFLORESCENCE.
  2. a growth of the tissue of the thallus in liverworts (see HEPATICA that covers and protects the ARCHEGONIUM.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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References in periodicals archive ?
Fresh involucral bracts (12 kg) were cut into pieces and repeatedly extracted with EtOH (4 X 51) at room temperature.
More advanced species have additional layers of defense of flowers, fruits, and/or leaves, including envelopment of flowers and fruits by closed involucral bracts and sepals, and deployment of resin and long, sharp trichomes.
They were observed on the tepals, bracts, bracteoles and involucral bracts.
Pilosellina must have stellate trichomes also on adaxial surface of leaves, stolons absent or, if present, scarce, short and relatively thick and thin involucral bracts with abundant and dominant long simple eglandular trichomes and more or less abundant stellate trichomes: in this area it can only be P.
15 mm in diameter, white, glabrous; scape bracts obovate, distinctly concave and inflated toward the apex, apex rounded to obtuse and apiculate, erect, entire, whitish-hyaline in the basal 3/5, red in the apical 2/5, inconspicuously and sparsely white-lepidote inside, glabrous outside, membranous, the upper ones somewhat involucral, 35-45 x 25 mm, about equaling 2/5 of the sepals length.
Within the inflorescence, branches are usually subtended by primary or involucral bracts (Goetghebeur, 1986).
It differs from most Mexican Scirpeae in having well developed leaves and foliaceous involucral bracts, characters shared with Bolboschoenus and Scirpus sensu stricto.
Muthama Muasya (Nairobi, Kenya) our specimen falls within the variability of Cyperus imbricatus although some characteristics are more or less aberrant: involucral bracts slightly wider, culms slightly thicker, inflorescence branches somewhat longer,.
Morlin plants have spines on the tip and along the margins of the leaves and involucral bracts.