34 



BOTANY OF CROP PLANTS 



are similar in appearance, it is quite evident that they are 

 capable of developing into different tissues. Just back of 



Xylem from the cambium 

 fhloom. from the procamblum and caml^luar 



(ylemfrom the cambium 

 Phloem from the procKVbium and cambium 



Fig. is. — Diagram showing the evolution of tissues from the primordial 

 meristem down to the beginning of cambial activity. {Afler Stevens.) 



the growing point, we note that the cells have differentiated 

 into three main regions: epidermis, ground meristem, and 



