Page 257 - Pharmacognosy 2 PG303

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

1. Rhatany root TS.; a, cork; b, parenchyma with starch; c,
pericyclic fibers; d, medullary ray; e, phloem; f, cambium; g, xylem
vessel; h, wood fibers; I, side medullar ray. 2. Wood elements; a, pitted
vessel; b, wood parenchyma

Powder
Powdered Rhatany root is bright red to reddish-brown, characterized by:
1-Very numerous fragments of lignified wood fibers, 12-30 µ wide, having oblique,
cleft-like pits, and other xylem elements.
2- Few fragments of yellow non-lignified phloem fibers.
3- Dark brown fragments of cork and of parenchyma cells.
4-Reddish-brown masses of phlobaphene, crystals of calcium oxalate in monoclinic
prisms, 6-24 µ and occasionally in micro-crystals.
5-Abundant starch granules, simple rarely compound of 2-4 components, spherical
pyriform, triangular or plano-convex, sometimes with a central radiating hilum,
4-40 µ in diameter, compound granules are composed of one large and one or
more small components, 10-20 µ in diameter.
6- Sclereids are absent.

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