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PHARMACOGNOSY. 
2. Sclerenchymatous fibers wanting. 
* Containing tannin. 
t With oil-secretion reservoirs. 
Starch grains ellipsoidal 87. Fruit of Cloves 
Reddish-brown tannin masses 88. Pimenta 
tf Oil-secretion reservoirs wanting. 
Light-brown tannin masses 89. Galla 
Calcium oxalate 45-70 /x 90. Geranium 
Calcium oxalate 50-100 ^ 90a. Rheum 
** Without tannin. 
Cryptocrystalline crystals .... 91. Belladonnse Radix 
/S Crystals in monoclinic prisms and pyramids. 
Crystal fibers 92. Frangula 
Sclerenchymatous fibers characteristic . . 93. Krameria 
Crystal fibers and stone cells . 93a. Rhamnus Purshiana 
y Crystal fibers present. 
1. Sclerenchymatous fibers strongly lignified. 
* Colored reddish with alkalies. 
Without stone cells 93b. Frangula 
With stone cells 94. Rhamnus Purshiana 
** Not colored reddish with alkalies. 
Stone cells characteristic 95. Quercus Alba 
Stone cells characteristic .... 96. Prunus Virginiana 
2. Sclerenchymatous fibers not strongly lignified. 
Fragments of ducts 97. Calamus 
No fragments of ducts 98. Ulmus 
S Calcium oxalate in raphides. 
1. Raphides not more than 10 /x long. 
No fragments of ducts 99. Cinnamomum 
Fragments of ducts present 100. Sarsaparilla 
2. Raphides 40-45 /x long. 
Spherical starch grains 3-12 /x 101. Convallaria 
Thick-walled parenchyma with simple 
pores 102. Cypripedium 
Ellipsoidal starch grains 7-20 /x . 103. Veratrum Viride 
e Calcium oxalate in cryptocrystalline crystals. 
Sclerenchymatous fibers few . . 103a. Belladonna Radix 
Bast fibers characteristic • • • 104. Cinchona 
b. Calcium-oxalate crystals wanting. 
a With non-secretion hairs. 
Greenish fragments with sulphuric acid, 105. Strophanthus 
/9 Non-secretion hairs wanting. 
1. Sclerenchymatous fibers present. 
* Ducts numerous. 
f Starch grains 2-5 m in diameter. 
