Classification of Leaves - all global updates

Classification of Leaves


·         External leaf characteristics (such as shape, margin, hairs, etc.) are important for identifying plant species


·         Leaves are determinant in growth i.e. they grow and achieve a specific pattern and shape, then stop


·         Other plant parts like stems or roots are non-determinant


·         Leaves are classified on the basis of:

§  Arrangement on the stem

§  Alternate, opposite, whorled, rosulate,

§  Divisions of the lamina 

§  Simple leaves, compound leaves (palmately compound leaves, pinnately compound leaves, binately compound leaves)

§  Leaf margin

§  Entire, ciliate, crenate, dentate, denticulate, doubly toothed, lobate, serrate, serrulate, lanceolate)

§  Leaf Apex

§  Acuminate, acute, cuspidate, ermaginate, obtuse, obcordate, mucronate,

§  Leaf base

§  Acuminte, acute, cordate, cuneate,

§  Surface of the leaf

§  Farinose, glabrouse, verucose, viscid, pubescent, hirsute, glandular)



Green Leaf Tree
§  Leaf Apex

§  Acuminate, acute, cuspidate, ermaginate, obtuse, obcordate, mucronate,

§  Leaf base

§  Acuminte, acute, cordate, cuneate,

§  Surface of the leaf

§  Farinose, glabrouse, verucose, viscid, pubescent, hirsute, glandular)


References

Evans, W. C. (2009). Trease and Evans Pharmacognosy. India: Reed Elsevier Limited.

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