PLATE VI. 



Fig. 21. Protuberance on stem. X 500. e, Epidermis; /, collenchyma. 



Fig. 22. Section of stem from epidermis to pith, x 500. g, Pith, h, 

 tracheal vessel; i, phloem; j, wood fibers; A", starch sheath; /, epidermis; 

 m, collenchyma; n, bast; o, parenchyma between bast groups. 



Fig. 23. Longitudinal section of pith, x 500. 

 Fig. 24. Cross section of pith. X 500. 



Fig. 25. Diagram of stem, x 70 p, Epidermis; q collenchyma; r, 

 phloem; s, bast; t, xylem; u, pith. 



