Page 257 - Pharmacognosy 2 PG303
P. 257

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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