Page 9 - Pharmacognosy-I (02-06-06-102)

2. Medicinal leaves mainly used as expectorant and
cough sedative:

GUAVA LEAVES
It is the dried leaves of Psidium guava family Myrtaceae.
Powdered Guava:
It is characterized microscopically by the following elements:

• Numerous unicellular wooly large characteristic non-
glandular trichomes.

• Fragments of oil glands.
• Numerous clusters and few prisms of calcium oxalate.
Constituents:
- It contains about 0.35% essential oil which consists mainly of
cineole and limonene.
- Flavonoids: quercetin and its glycosides.
Uses:
- It is used astringent, expectorant, cough sedative, antiseptic for
respiratory tract.

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