petal

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petal,

one of the four basic parts of a flowerflower,
name for the specialized part of a plant containing the reproductive organs, applied to angiosperms only. A flower may be thought of as a modified, short, compact branch bearing lateral appendages.
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, next innermost organ from the sepal. The whorl of petals is known collectively as the corolla [Lat.,=little crown]. The number of petals is usually constant within groups (e.g., five in the rose family), as are the numbers of the other organs. Identification by number is, however, complicated by various factors; the petals may be fused, inconspicuous, or entirely absent, in which case their role as the showy part of the flower is sometimes supplanted by modified leaves, the bracts, as in the dogwood and poinsettia, or by modified stamens, as in the canna and the lady's-slipper. Selective breeding can produce petallike stamens (e.g., in cultivated roses and geraniums) and so-called double flowers, i.e., varieties with more than the normal number of petals. Petals are usually brightly colored and often secrete perfume and nectar (in nectaries at the base of the petal) that attract insects and birds needed for cross-pollination. When fertilization has taken place the petals usually drop off; however, in some flowers they persist (see everlastingeverlasting
or immortelle
, names for numerous plants characterized by papery or chaffy flowers that retain their form and often their color when dried and are used for winter bouquets and decorations.
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). In general there are fewer petals and their fusion is greater as the evolutionary development increases. Radially symmetrical arrangement also gives way to bilateral symmetry or even asymmetry.

Petal

 

a leaflike member of the corolla in a flower, which is generally brightly colored. In sympetalous plants, the petals are grown together to some degree. The leaflets of simple corolliform perianths are sometimes erroneously called petals.

petal

[′ped·əl]
(botany)
One of the sterile, leaf-shaped flower parts that make up the corolla.

petal

One of the overlapping shingles or tiles in imbrication.

petal

any of the separate parts of the corolla of a flower: often brightly coloured
References in periodicals archive ?
Optimization of Petaloid Base Dimensions and Process Operating Conditions to Minimize Environmental Stress Cracking in Injection Stretch Blow Moulded PET Bottles," PhD Thesis, RM1T University, Australia (2008).
As stamens abort, petaloid structures develop and tend to dominate the floral display (Fig.
In Costaceae, species pollinated generally by insects have open light-colored flowers with a large petaloid labellum, forming the ancestral floral form of this family.
In the past, different interpretations have been given for the petaloid antesepalous scales.
in some Caryophyllaceae), this kind of petaloid staminodes are best called "Petalostaminodia.
In Ranunculaceae there are transition series from inconspicuous staminodes to elaborate petaloid nectar leaves occurring among genera (Ronse Decraene & Smets, 1995b).
Expression of this type of corona varies; flat, petaloid ligules, which may or may not be united (e.
Thecae not agglutinated to style head; anthers weakly attached to style head at one level; flat, petaloid corona segments mostly present in petal sinuses; disc almost always absent; trees, rarely lianas Wrightieae 2.
Corolla salveriform to infundibuliform or rarely tubular campanulate; aestivation sinistrorse in Wrightia, Pleioceras, and Stephanostemma; often with conspicuous corona of flat, petaloid segments in mouth.
is said to be particularly well suited for use in the latest high-output preform injection machines and reheat stretch-blowing systems for carbonated soft-drink (CSD) bottles with either petaloid or champagne base.
We concluded that, in the helobial monocotyledons as a whole, inflorescence bracts, sepals, and tepals are homologous structures derived from the phyllomic appendages of the original multiaxial reproductive structure and, therefore, that the divergence between the petaloid and tepaloid groups involved divergence of the relationships between phyllome and subtended structure, at the same time as the axes of the original multiaxial structure became differentiated into "flower" and "inflorescence.
Calyx (2-) 4-5-merous; usually actinomorphic or rarely not so (outer lobe large and petaloid in Usteria); connate or free.