CHAPTER XV. 

 NEW PLANTS WITHOUT SEED. 



Flowering plants usually reproduce by seeds, but reproduc- 

 tion may take place by other methods. 



Fig. 107.— Lily grow- 

 ing in ostrich egg. 



Some species of Oxalis have a vigorous underground stem 

 system, upon which bulbs in great number are formed.^ 



1 In these species long roots filled with sap may be found in early 

 winter. As these give up their sap to the brood of young plants they 



119 



