THE ANATOMY OF THE STEM OF THE BERBERIDACEiE. 
515 
EXPLANATION OF PLATE. 
Fig. 1. Transverse section, stem of Berberis vulgaris (diagrammatic). 
Fig. 2. Transverse section, young stem of B. vulgaris, showing deep-seated ring of large cork cells, 
x 450. 
Fig. 3. Transverse section, stem of B. elegans, showing calcium oxalate crystals in medullary ray 
cells. x 450. 
Fig. 4. Longitudinal section, stem of B. vulgaris. Sieve tubes showing sieve plates and callus 
plugs, x 450. 
Fig. 5. Longitudinal section, stem of B. vulgaris. Xylem and medullary ray. x 450. 
Fig. 6. Epidermal cells and hairs of B. Darwinii. x 40. 
Fig. 7. Transverse section, stem of B. aristata, showing folding of the walls of sub-epidermal 
parenchyma, x 450. 
Fig 8. Transverse section, stem of B. angulosa (diagrammatic). 
Fig. 9. Transverse section, spine of B. setnensis (diagrammatic). 
Fig. 10. Longitudinal section, stem of B. empetrifolia. External cortex, showing bridging of inter- 
cellular spaces. x 450. 
Fig. 11. Transverse section, stem of B. Bosclianii (diagrammatic). 
Fig. 12. Longitudinal section, stem of B. Wallichiana, showing short blunt medullary rays. x 450. 
Fig. 13. Transverse section, rhizome of Achlys triphylla (diagrammatic). 
Fig. 14. Transverse section, stem of Podophyllum Emodi (diagrammatic). 
Fig. 15. Transverse section, stem of Berberidopsis corallina. x 450. ' 
Figs. 16 and 17. Transverse section and longitudinal section, stem of B. corallina. Stone cells of 
pericycle. x 450. 
Fig 18. Longitudinal section, stem of B. corallina. Xylem elements with loose reticulate markings. 
. x 450. 
Fig. 19. Transverse section, rhizome of Vancouveria hexandra (diagrammatic). 
Fig. 20. Transverse section, stem of Hydrastis canadensis (diagrammatic). 
Fig. 21. Transverse section, stem of Jeffersonia dubia (diagrammatic). 
