Page 225 - Pharmacognosy 2 PG303 (1)

Pharmacognosy-2 (PG303) Level 2 Clinical Pharmacy-Pharm D

Powdered Indian Valerian differs from that of the European in the
following:
1- The root hairs and endodermal cells are slightly lignified.
2- The cortical cells are elongated, 6-10 times as long as broad and the
starch granules are simple or compound with 2 components, and bigger, 4-
30 mostly 10-25 µ in diameter.

1- Piliferous layer of the root in surface view showing scars of root hairs (cic.)
and underlying hypodermis (h.).

2- Starch granules.

3- Fragments of the piliferous layer with attached root hairs and a detached root
hair.
4- Two layers of sclereids from the stem base.

5- Piliferous layer in oblique sectional view showing broken root hairs

6- Parenchyma in transverse sectional view

7- Reticulately thickened vessels

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