PLATE 32 



Porous and Striated Stone Cells 



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



2. Winter's-bark {Driniys winleri, Forst.). 



3. Bitterroot (Apocynum androscemifolium, L.). 



4. Allspice {Pimenta officinalis, Lindl.). 



5. Aconite (Aconitum napelliis, L.). 



