Classification of leaf on different basis

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    15-Jul-2015

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Classification of leafClassification of leafWe can use following morphological basis for classification of leafOn the basis of petioleOn the basis of laminaOn the basis of arrangementOn the basis of venationOn the basis of location1. ON THE BASIS OF PETIOLEOn the basis of petiole leaf may bePetiolate or sessilePetioles are of different typesPetiolate leaves are that leaves which have Petiole for example leaf of mulberry(tooth),rose etcSessile are these leaves which do not posses petiole e.g. leaves of maze ,onion etcSub Sessile leaves have very small petiolePetiolate and sessile leavesSessile leavesPetiolate Petiolate leaves2. ON THE BASIS OF LAMINAOn the basis lamina leaf can classified asOn the basis of lamina sizeOn the basis of lamina shapeOn the basis of lamina divisionOn the basis lamina marginsOn the basis of lamina apexOn the basis of lamina sizeLamina size greatly varies usually due climatic condition or habitat of plant . It has three main categoriesLarge usually in hydrophytesMedium in mesophytesSmall or narrow in xerophytesHydrophytic leavesMesophytic leavesXerophytic leaves2. On the basis of lamina shapeOn the basis of lamina shape leaves have following main structureHand shaped or star shaped Oval shape called elliptical or ovateLyrate large lamina with smaller lobes e.g. radishSpathulate spoon likeLanceolate e.g. onionOblique leaf having un equal halvesLeaf shapesLeaf shapesLeaf shapesLeaf shapesOn the basis of lamina divisionOn the basis of lamina division leaves may be simple or compoundSimple leaves are those leaves which have lamina in one pieceCompound are those which have lamina divided into pieces or leaf lets and they contain main rachis compound may be pinnate or palmatePinnate Compound leafThe leaf in which lamina is divided into leaflets along leaf petioleBipennate in which each pinna again divideTripennate in which each pinna trice divideDecompound in which leaf let is divide more than tricePinnate compoundDecompound leafPinnate compoundPalmate compound leafWhen leaflets arranged in such a manner that seems to be arise from same point and have hand like appearanceUnifliate single leafletsBifoliate two leafletsTrifoliate three leafletsMulti foliate more than four lealetsPalmate compoundOn the basis of lamina marginLeaf margins greatly varies some are followingEntire ;smooth continuous marginDentate ; large teeth marginSerrate ; margin with upward cutsIncised ; margin with irregular cuts , deep in shapeEntire leafDentate leafSerrate leaf Incised leavesUndulate leavesLamina surfaceLamina surface also varies some conmen types are followingHairy contain hairsGlabrous smoothGlaucous leaf surface shiy and greenSpiny covered by spinesOily having secretion at the surfaceHairy leaf surfaceGlabrous leaf surfaceGlauceous leaf surfaceSpiny leaf surfaceOn the basis of leaf apexOn the basis of leaf apex leaves have following typesAcute shape apex ending in pointObtuse blunt or rounded apexAcuminate long and pointed apexCuspinate end of sharp spiny pointEmerginate leaf apex with notchMucronate abruptly terminate at spiny pointAcute Obtuse Acuminate Cuspinate EmerginateMucronate Leaf apexOn the basis of arrangementAccording to phyllotoxi or arrangement of leaves on branches have following typesAlternate thy are alternately arrangedOpposite two leaves arise from the node at the same timeWhorl many leaves arise from the node at the same timeArrangement of leavesLeaf locationAccording to location leaf have following typesRadical present near the roots Cauline leaves arise from main stem onlyRamal arise from main stem and breachesLeaf locationOn the basis of venationArrangement of veins or vein lets in leaf called venation It has following typesReticulate venation net like arrangementParallel veins arrange in parallel mannerUnicostate lamina contain only one main veinMulticostate lamina contain many veins Pinnate in which veins grow opposite to medribVenation in leafBus Kafi hay yar itna ok Da ALLAH PA AMAN

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