710 BOTANY AND PHARMACOGNOSY. 



a In rosette-shaped crystals. Continued. 

 2. Crystals not less than lo ," in diameter. 

 * Pollen grains numerous. 



Crystals numerous 173. Caryophyllus 



Crystals few 174. Insect Powder 



** Pollen grains few. 

 t Ducts present. 



Glandular and non-glandular hairs. 



175. Cusso 

 tt Ducts wanting. 



Stone cells few.... 176. Viburnum Opulus 

 Stone cells numerous. 



177. Viburnum Prunifolium 

 /3 Calcium oxalate in monoclinic prisms. 



1. Numerous seeds. 



Characteristic odor 178. Vanilla 



2. Seeds wanting. 



Stone cells few 179. Viburnum Opulus 



Stone cells numerous, characteristic. 



180. Viburnum Prunifolium 



Numerous oil globules 181. Xanthoxylum 



7 Calcium oxalate in crystal fibers. 



Stone cells characteristic 182. Quercus Alba 



b. Calcium oxalate wanting. 



a Containing pollen grains. 



s. Non-glandular hairs numerous 183. Arnicse Floics 



Spherical pollen grains 184. Crocus 



Non-glandular hairs few 185. Santonica 



/3 Pollen grains zvanting. 



1. Stone cells numerous. 



Fragments wine-colored with sulphuric acid. 



186. Cubeba 



Characteristic stone cells 187. Delphinium 



Green fluorescence in chloral mount. 



188. Stramonii Semen 

 Ducts reticulate 189. Pyrethruni 



2. Stone cells wanting. 



Non-lignified intermediate fibers. ... 190. Gentiana 



Few fragments of tissues 191. Opium 



Trachcc-e with elongated, narrow pores. 



192. Taraxacum 



Trache?e with large, simple pores 193. Chicory 



Ducts spiral, annular or with simple pores. 



194. Triticum 



