PLATE 24 



POROUS AND NON-STRIATED BAST FIHRKS 



1. Sarsaparilla root (Hypoderm), (Smilax officinalis, Kunth). 



2. I'nicorn root (EndodermJ. 



3. Marshmallow root (Althcea officinalis, L.) 



4. Echinacea root (Echinarra an^itsfifolia, D. C.), 



