Contents 1 Origin 2 Properties and shape 3 Gallery 4 See also 5 References


Origin[edit] A Lilium flower showing the six tepals: the outer three are sepals and the inner three are petals. Undifferentiated tepals are believed to be the ancestral condition in flowering plants. For example, Amborella, which is thought to have separated earliest in the evolution of flowering plants,[4] has flowers with undifferentiated tepals. Distinct petals and sepals would therefore have arisen by differentiation, probably in response to animal pollination. In typical modern flowers, the outer or enclosing whorl of organs forms sepals, specialised for protection of the flower bud as it develops, while the inner whorl forms petals, which attract pollinators. Tepals formed by similar sepals and petals are common in monocotyledons, particularly the "lilioid monocots". In tulips, for example, the first and second whorls both contain structures that look like petals. These are fused at the base to form one large, showy, six-parted structure (the perianth). In lilies the organs in the first whorl are separate from the second, but all look similar, thus all the showy parts are often called tepals. Where sepals and petals can in principle be distinguished, usage of the term "tepal" is not always consistent – some authors will refer to "sepals and petals" where others use "tepals" in the same context. In some plants the flowers have no petals, and all the tepals are sepals modified to look like petals. These organs are described as petaloid, for example, the sepals of hellebores. When the undifferentiated tepals resemble petals, they are also referred to as "petaloid", as in petaloid monocots, orders of monocots with brightly coloured tepals. Since they include Liliales, an alternative name is lilioid monocots.


Properties and shape[edit] Terms used in the description of tepals include pubescent (with dense fine, short, soft hairs, downy), puberulent (minutely pubescent, hairs barely visible to the naked eye) and puberulous (dense covering of very short soft hairs). Tepal shape is described in similar terms to those used for leaves (see Glossary of leaf morphology).


Gallery[edit] Flowers with tepals Flowers of Magnolia × alba showing tepals in various stages of development Tepals of Magnolia × wieseneri A hellebore flower showing the petaloid sepals A Sternbergia lutea flower showing the two whorls of tepals A tulip flower showing the petal-like tepals Tepals of Blandfordia nobilis, another lilioid monocot


See also[edit] Glossary of plant morphology Plant reproductive morphology


References[edit] ^ Augustin Pyramus de Candolle (1827). Organographie végétale, ou Description raisonnée des organes des plantes; pour servir de suite et de développement a la théorie élémentaire de la botanique, et d'introduction a la physiologie végétale et a la physiologie végétale et a la description des familles. Paris: Deterville. p. 503.  ^ Augustin Pyramus de Candolle (1841). Vegetable organography; or, An analytical description of the organs of plants. 2. Translated by Boughton Kingdon. London: Houlston & Stoneman. p. 90.  ^ Stearn, William Thomas (2004). Botanical Latin (p/b ed.). David & Charles/Timber Press. ISBN 978-0-7153-1643-6.  p. 39. ^ Ronse De Craene, L. P. (2007). "Are Petals Sterile Stamens or Bracts? The Origin and Evolution of Petals in the Core Eudicots". Annals of Botany. 100 (3): 621–630. doi:10.1093/aob/mcm076. PMC 2533615 . PMID 17513305.  Botany: A Brief Introduction To Plant Biology - 5th ed. Thomas L. Rost; T. Elliot Weier - Wiley & Sons 1979 ISBN 0-471-02114-8. Plant Systematics - Jones; Samuel - McGraw-Hill 1979 ISBN 0-07-032795-5. v t e Botany History of botany Subdisciplines Plant systematics Ethnobotany Paleobotany Plant anatomy Plant ecology Phytogeography Geobotany Flora Phytochemistry Plant pathology Bryology Phycology Floristics Dendrology Plant groups Algae Archaeplastida Bryophyte Non-vascular plants Vascular plants Spermatophytes Pteridophyte Gymnosperm Angiosperm Plant morphology (glossary) Plant cells Cell wall Phragmoplast Plastid Plasmodesma Vacuole Tissues Meristem Vascular tissue Vascular bundle Ground tissue Mesophyll Cork Wood Storage organs Vegetative Root Rhizoid Bulb Rhizome Shoot Stem Leaf Petiole Cataphyll Bud Sessility Reproductive (Flower) Flower development Inflorescence Umbel Raceme Bract Pedicellate Flower Whorl Floral symmetry Floral diagram Floral formula Receptacle Hypanthium (Floral cup) Perianth Tepal Petal Sepal Sporophyll Gynoecium Ovary Ovule Stigma Archegonium Androecium Stamen Staminode Pollen Tapetum Gynandrium Gametophyte Sporophyte Plant embryo Fruit Fruit anatomy Berry Capsule Seed Seed dispersal Endosperm Surface structures Epicuticular wax Plant cuticle Epidermis Stoma Nectary Trichome Prickle Plant physiology Materials Nutrition Photosynthesis Chlorophyll Plant hormone Transpiration Turgor pressure Bulk flow Aleurone Phytomelanin Sugar Sap Starch Cellulose Plant growth and habit Secondary growth Woody plants Herbaceous plants Habit Vines Lianas Shrubs Subshrubs Trees Succulent plants Reproduction Evolution Ecology Alternation of generations Sporangium Spore Microsporangia Microspore Megasporangium Megaspore Pollination Pollinators Pollen tube Double fertilization Germination Evolutionary development Evolutionary history timeline Hardiness zone Plant taxonomy History of plant systematics Herbarium Biological classification Botanical nomenclature Botanical name Correct name Author citation International Code of Nomenclature for algae, fungi, and plants (ICN) - for Cultivated Plants (ICNCP) Taxonomic rank International Association for Plant Taxonomy (IAPT) Plant taxonomy systems Cultivated plant taxonomy Citrus taxonomy cultigen cultivar Group grex Practice Agronomy Floriculture Forestry Horticulture Lists Related topics Botanical terms Botanists by author abbreviation Botanical expedition Category Portal WikiProject Retrieved from "https://en.wikipedia.org/w/index.php?title=Tepal&oldid=820151718" Categories: Plant morphology


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Tepal - Photos and All Basic Informations

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EnlargeFlowerPerianthSepalPetalMagnoliaWhorl (botany)LiliumAugustin Pyramus De CandolleEnlargeLiliumFlowering PlantAmborellaPollinatorMonocotyledonLilioid MonocotTulipLiliumPetaloidHelleborePetaloid MonocotsLilialesGlossary Of Leaf MorphologyMagnolia × AlbaMagnolia × WieseneriHelleboreSternbergia LuteaBlandfordia NobilisLilioid MonocotGlossary Of Plant MorphologyPlant Reproductive MorphologyInternational Standard Book NumberSpecial:BookSources/978-0-7153-1643-6Digital Object IdentifierPubMed CentralPubMed IdentifierInternational Standard Book NumberSpecial:BookSources/0-471-02114-8International Standard Book NumberSpecial:BookSources/0-07-032795-5Template:BotanyTemplate Talk:BotanyBotanyHistory Of BotanyBranches Of BotanyHistory Of Plant SystematicsEthnobotanyPaleobotanyPlant AnatomyPlant EcologyPhytogeographyGeobotanical ProspectingFloraPhytochemistryPlant PathologyBryologyPhycologyFloristicsDendrologyPlantAlgaeArchaeplastidaBryophyteNon-vascular PlantVascular PlantSpermatophytePteridophyteGymnospermFlowering PlantPlant MorphologyGlossary Of Plant MorphologyPlant CellCell WallPhragmoplastPlastidPlasmodesmaVacuoleTissue (biology)MeristemVascular TissueVascular BundleGround TissueLeafCork CambiumWoodStorage OrganRootRhizoidBulbRhizomeShootPlant StemLeafPetiole (botany)CataphyllBudSessility (botany)Plant Reproductive MorphologyABC Model Of Flower DevelopmentInflorescenceUmbelRacemeBractPedicel (botany)FlowerWhorl (botany)Floral SymmetryFloral DiagramFloral FormulaReceptacle (botany)HypanthiumPerianthPetalSepalSporophyllGynoeciumOvary (botany)OvuleStigma (botany)ArchegoniumStamenStamenStaminodePollenTapetum (botany)Column (botany)GametophyteSporophyteEmbryoFruitFruit AnatomyBerry (botany)Capsule (fruit)SeedSeed DispersalEndospermEpicuticular WaxPlant CuticleEpidermis (botany)StomaNectarTrichomeThorns, Spines, And PricklesPlant PhysiologyPlant NutritionPhotosynthesisChlorophyllPlant HormoneTranspirationTurgor PressureBulk MovementAleuronePhytomelaninSugarSapStarchCelluloseSecondary GrowthWoody PlantHerbaceous PlantHabit (biology)VineLianaShrubSubshrubTreeSucculent PlantPlant ReproductionPlant EvolutionPlant EcologyAlternation Of GenerationsSporangiumSporeMicrosporangiaMicrosporeSporangiumMegasporePollinationPollinatorPollen TubeDouble FertilizationGerminationPlant Evolutionary Developmental BiologyEvolutionary History Of PlantsTimeline Of Plant EvolutionHardiness ZonePlant TaxonomyHistory Of Plant SystematicsHerbariumTaxonomy (biology)Botanical NomenclatureBotanical NameCorrect NameAuthor Citation (botany)International Code Of Nomenclature For Algae, Fungi, And PlantsInternational Code Of Nomenclature For Cultivated PlantsTaxonomic RankInternational Association For Plant TaxonomyList Of Systems Of Plant TaxonomyCultivated Plant TaxonomyCitrus TaxonomyCultigenCultivarCultivar GroupGrex (horticulture)AgronomyFloricultureForestryHorticultureGlossary Of Botanical TermsList Of BotanistsList Of Botanists By Author Abbreviation (W–Z)Botanical ExpeditionCategory:BotanyPortal:PlantsWikipedia:WikiProject PlantsHelp:CategoryCategory:Plant MorphologyDiscussion About Edits From This IP Address [n]A List Of Edits Made From This IP Address [y]View The Content Page [c]Discussion About The Content Page [t]Edit This Page [e]Visit The Main Page [z]Guides To Browsing WikipediaFeatured Content – The Best Of WikipediaFind Background Information On Current EventsLoad A Random Article [x]Guidance On How To Use And Edit WikipediaFind Out About WikipediaAbout The Project, What You Can Do, Where To Find ThingsA List Of Recent Changes In The Wiki [r]List Of All English Wikipedia Pages Containing Links To This Page [j]Recent Changes In Pages Linked From This Page [k]Upload Files [u]A List Of All Special Pages [q]Wikipedia:AboutWikipedia:General Disclaimer



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