PLATE 32 



POROUS AND STRIATED STONE CELLS 



1. Ruellia root (Ruellia ciliosa, Pursh.). 



2. Winter's-bark (Drimys winteri, Forst.). 



3. Bitterroot (Apocynum andros&mifolium, L.). 



4. Allspice (Pimento, officinalis, Lindl.). 



5. Aconite (Aconitum napellus, L.). 



