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

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. 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. Petiolate and sessile leaves

4. Sessile leaves

5. Petiolate

6. Petiolate leaves

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. 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. Hydrophytic leaves

10. Mesophytic leaves

11. Xerophytic leaves

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. Leaf shapes

14. Leaf shapes

15. Leaf shapes

16. Leaf shapes

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. 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. Pinnate compound

20. Decompound leaf

21. Pinnate compound

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. Palmate compound

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. Entire leaf

26. Dentate leaf

27. Serrate leaf

28. Incised leaves

29. Undulate leaves

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. Hairy leaf surface

32. Glabrous leaf surface

33. Glauceous leaf surface

34. Spiny leaf surface

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. Acute

37. Obtuse

38. Acuminate

39. Cuspinate

40. Emerginate

41. Mucronate

42. Leaf apex

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. Arrangement of leaves

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. Leaf location

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. Venation in leaf