324 



MORPHOLOG Y. 



(microspores) in the anther sacs (microsporangia) and of ovules 

 (macrosporangia) on the margins of each half of the pistil, we 

 are, from our previous studies, able to recognize here that all the 

 members of the flower belong to the leaf series. 



648. In trillium and in the pepper root we have seen that the 

 parts of the flower in each apparent whorl are either of the same 

 number as the leaves in a whorl, or some multiple of that num- 

 ber. This is true of a large number of other plants, but it is not 

 true of all. A glance at the spring beauty (Claytonia virginiana, 

 and at the anemone (or Isopyrum biternatum, fig. 563) will 

 serve to show that the number of the different members of the 

 flower may vary. The trillium and the dentaria were selected 

 as being good examples to study first, to make it very clear that 

 the members of the flower are fundamentally leaf structures, or 

 rather that they belong to the same series of members as do the 

 leaves of the plant. 



649. Synopsis of members of the sporophyte in angiosperms. 



Higher plant. 

 Sporophyte phase 



(or modern phase). Leaf 



Foliage leaves. 

 Perianth leaves. 

 Spore-bearing leaves 



with sporangia. 

 (Sporangia sometimes 



on shoot.) 



Flower. 



