114 



SCIENTIFIC AND APPLIED PHARMACOGNOSY 



blackish-brown and occasionally with the fibrous bases of decayed 

 leaves and short fragments of the stout roots; fracture, short, resin- 

 ous; internally reddish-brown, with a distinct yellowish endodermis 

 within which are the whitish, scattered vascular bundles; odor 

 slightly aromatic; taste sweetish, bitter and slightly acrid. 

 Inner Structure. See Fig. 45. 



FIG. 45. Rhizomes of Iris versi color. A, diagram of transverse section showing 

 vascular bundles (a and c) ; endodermis (6) . B, portion of rhizome showing 

 parenchyma (p) and intercellular spaces (a), endodermis (6); closed ring of 

 sclerenchymatous fibers shown in longitudinal view (sc) ; concentric vascular 

 bundle of the leptocentric type. C, transverse section of root showing 

 epidermis (a); cortical parenchyma (6); central stele with endodermis (d); 

 pericambial layer (e); leptome (I) and tracheae (c and/), those at the peri- 

 phery being smaller. D, crystals of calcium oxalate. E, cells of parenchyma 

 with amylo-dextrin starch grains, i.e., becoming reddish with solution of 

 iodin. After Bastin. 



Powder. Reddish-brown; numerous fragments of parenchyma 

 associated with resin cells, the latter being colored from a yellowish- 



