388 



PLANT MORPHOLOGY 



Megaspore I I HI IS" Y Mature 



Mother Cell Division Division Division Division Division Embryo Sac 



o 



Ordinary Type 



o 



Oenothera 



Allium 



Peperomia 



Penaea 



(0 01 



Fritiilaria 







Plumbagelia 



o 



Plumbago 



Adoxa 



Fig. 332. Principal types of embryo-sac development in aiigiosperms. 



