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Dic Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD

1- Meristems
The continued growth of the plants throughout their lives depend upon the activity of
meristematic tissue. These meristematic cells retain the power of dividing to form new
cells indefinitely.

Classification of meristems:

They are classified, as regards their position in the plant body, into:

1) Apical: located at the apices of main and lateral shoots and

roots.

2) Intercalary: lie at the internodes of monocot. plants

3) Lateral: arranged parallel with the sides of the organ such as

the vascular cambium, cork cambium and interfascicular cambium.

Vascular cambium: (1ry meristem) located between the xylem and

phloem.

Cork cambium (phellogen): (2ry meristem) It divides tangentially

producing cork cells to the outside and phelloderm to the inside.

Interfascicular cambium: (2ry meristem) originates between vascular

bundles of the stem.

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