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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]


, 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.


  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.
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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.
5 mm de largo, las exteriores por lo comun mas cortas y angostas, por lo general todas glabras, receptaculo conico, paleas exteriores anchamente elipticas a obovadas, a menudo lobadas en el apice, agrupadas en conjuntos de 2 o 3 y rodeando al aquenio de la flor periferica en union con la bractea involucral adyacente, las paleas interiores lanceoladas a obovadas, por lo comun mas o menos profundamente trifidas, rara vez bifidas o enteras, cafes; flores perifericas (3)5(8), su tubo de ca.
The inflorescences also have longer bracts, with the longest (lowest) involucral bract being 1.
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.
From the Greek hyaleos, of glass, transparent, probably because of the light color of the leaves or the shiny, scarious involucral bracts.
Montola 2000 plants have spines on the leaf tips, along leaf margins, and involucral bracts.
The extinct genus Paleocarpinus from the Paleocene of England, France, and western North America produced flattened, ribbed nutlets between two leafy, involucral bracts (Crane, 1989) that may have been wind dispersed.