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Classification of leaf on different basis


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the presentation is about the leaf classification and types of leaves with shapes and differentiation

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Classification of leaf on different basis

  1. 1. We can use following morphological basis for classification of leaf 1. On the basis of petiole 2. On the basis of lamina 3. On the basis of arrangement 4. On the basis of venation 5. On the basis of location
  2. 2. 1. ON THE BASIS OF PETIOLE On the basis of petiole leaf may be  Petiolate or sessile  Petioles are of different types  Petiolate leaves are that leaves which have Petiole for example leaf of mulberry(tooth),rose etc  Sessile are these leaves which do not posses petiole e.g. leaves of maze ,onion etc  Sub Sessile leaves have very small petiole
  3. 3. Petiolate and sessile leaves
  4. 4. Sessile leaves
  5. 5. Petiolate
  6. 6. Petiolate leaves
  7. 7. 2. ON THE BASIS OF LAMINA  On the basis lamina leaf can classified as 1. On the basis of lamina size 2. On the basis of lamina shape 3. On the basis of lamina division 4. On the basis lamina margins 5. On the basis of lamina apex
  8. 8. On the basis of lamina size  Lamina size greatly varies usually due climatic condition or habitat of plant . It has three main categories 1. Large usually in hydrophytes 2. Medium in mesophytes 3. Small or narrow in xerophytes
  9. 9. Hydrophytic leaves
  10. 10. Mesophytic leaves
  11. 11. Xerophytic leaves
  12. 12. 2. On the basis of lamina shape  On the basis of lamina shape leaves have following main structure 1. Hand shaped or star shaped 2. Oval shape called elliptical or ovate 3. Lyrate large lamina with smaller lobes e.g. radish 4. Spathulate spoon like 5. Lanceolate e.g. onion 6. Oblique leaf having un equal halves
  13. 13. Leaf shapes
  14. 14. Leaf shapes
  15. 15. Leaf shapes
  16. 16. Leaf shapes
  17. 17. On the basis of lamina division  On the basis of lamina division leaves may be simple or compound 1. Simple leaves are those leaves which have lamina in one piece 2. Compound are those which have lamina divided into pieces or leaf lets and they contain main rachis compound may be pinnate or palmate
  18. 18. Pinnate Compound leaf  The leaf in which lamina is divided into leaflets along leaf petiole 1. Bipennate in which each pinna again divide 2. Tripennate in which each pinna trice divide 3. Decompound in which leaf let is divide more than trice
  19. 19. Pinnate compound
  20. 20. Decompound leaf
  21. 21. Pinnate compound
  22. 22. Palmate compound leaf  When leaflets arranged in such a manner that seems to be arise from same point and have hand like appearance 1. Unifliate single leaflets 2. Bifoliate two leaflets 3. Trifoliate three leaflets 4. Multi foliate more than four lealets
  23. 23. Palmate compound
  24. 24. On the basis of lamina margin  Leaf margins greatly varies some are following 1. Entire ;smooth continuous margin 2. Dentate ; large teeth margin 3. Serrate ; margin with upward cuts 4. Incised ; margin with irregular cuts , deep in shape
  25. 25. Entire leaf
  26. 26. Dentate leaf
  27. 27. Serrate leaf
  28. 28. Incised leaves
  29. 29. Undulate leaves
  30. 30. Lamina surface  Lamina surface also varies some conmen types are following 1. Hairy contain hairs 2. Glabrous smooth 3. Glaucous leaf surface shiy and green 4. Spiny covered by spines 5. Oily having secretion at the surface
  31. 31. Hairy leaf surface
  32. 32. Glabrous leaf surface
  33. 33. Glauceous leaf surface
  34. 34. Spiny leaf surface
  35. 35. On the basis of leaf apex  On the basis of leaf apex leaves have following types 1. Acute shape apex ending in point 2. Obtuse blunt or rounded apex 3. Acuminate long and pointed apex 4. Cuspinate end of sharp spiny point 5. Emerginate leaf apex with notch 6. Mucronate abruptly terminate at spiny point
  36. 36. Acute
  37. 37. Obtuse
  38. 38. Acuminate
  39. 39. Cuspinate
  40. 40. Emerginate
  41. 41. Mucronate
  42. 42. Leaf apex
  43. 43. On the basis of arrangement  According to phyllotoxi or arrangement of leaves on branches have following types 1. Alternate thy are alternately arranged 2. Opposite two leaves arise from the node at the same time 3. Whorl many leaves arise from the node at the same time
  44. 44. Arrangement of leaves
  45. 45. Leaf location  According to location leaf have following types 1. Radical present near the roots 2. Cauline leaves arise from main stem only 3. Ramal arise from main stem and breaches
  46. 46. Leaf location
  47. 47. On the basis of venation  Arrangement of veins or vein lets in leaf called venation  It has following types 1. Reticulate venation net like arrangement 2. Parallel veins arrange in parallel manner 3. Unicostate lamina contain only one main vein 4. Multicostate lamina contain many veins 5. Pinnate in which veins grow opposite to medrib
  48. 48. Venation in leaf