MOKPIIOLOGY OF sper;\[atopiiytks 



I. THE VEGETATIVE ORGANS 



THE stEiM; 



The columnar or tul)erons stems, with no distinguishable 

 internodes, are usually eomplctel}' invested Ijy an armor of thick 





^/^ .1 T3 = 



— > 



leaf bases and scale loaves, sonu' tuberous stems resembliuii- 

 huge cones. Probably the greatest height is attained bv species 



