PLATE 89 



CROSS-SECTION OF ROOT OF SPIGELIA MARYLANDICA, L. 

 i. Epidermis. 2. Cortical parenchyma. 2'. Intercellular space, 

 dodermis. 4. Pericycle. 5. Cambium. 6. Xylem. 7. Pith. 



3. En- 



