7o6 BOTANY AND PHARMACOGNOSY. 



2. Pigment cells present. — Continued. 



Short sclerenchymatous fibers 79. Linum 



A colorless layer of cells with minute starch 



grains 80. Cydonium 



/3 Sclerenchymatous tissue wanting. 



1. Pollen grains numerous. 



Fragments of pappus 81. Arnicse Floras 



Pollen grains smooth 82. Sambucus 



Pollen grains spinose 83. Matricaria 



2. Pollen grains few. 



Pollen grains prickly 84. Calendula 



Pollen grains nearly smooth 85. Crocus 



Corolla white 86. Anthemis 



Bitter, ducts scalariform 87. Chirata 



3. Pollen grains wanting. 



* Fibrovascular tissue present. 



Containing inulin masses .88. Lappa 



Sclerenchymatous fibers numerous. 89. Senega 

 Starch and scalariform tracheae. .90. Aspidium 

 ** Fibrovascular tissue wanting. 



Few fragments of tissues gi. Cambogia 



Large glandular hairs 92. Lupulinum 



Tetrahedral spores 93. Lycopodiuni 



II. Few or No Fragments of Vegetable Tissue. 



A. Giving off odor of sulphur dioxide on heating. 



Rounded masses in chains 94. Sulphur Lotum 



Rounded masses in irregular groups.. 95. Sulphur Prsecipitatum 



B. No ODOR OF SO2 ON HEATING. 



a. Nearly colorless in glycerin mount. 



Transparent, irregular masses 96. Mastiche 



b. Yellowish in glycerin mount. 



". Containing oil globules. 



Irregular masses 97. Scammonium 



;8 Transparent or translucent. 



Soluble in cold alcohol 98. Colophony 



Insoluble in cold alcohol 99. Sandarac 



Reddish with alkalies 100. Aloe (Cape) 



y More opaque. 



Light or grayish particles loi. Ammoniac 



Yellowish particles 102. Cambogia 



