64 



PRINCIPLES OF PLANT-TERATOLOGY. 



But in some cases there are, instead of one, two 

 centres in the whole flower around which the floral 

 members are arranged in reverse order and with 

 inverse orientation ; in such we have the equivalent, 



Pig. 80. — Rosa centifoUa (Garden Eose). A "rogue" rose (afflicted 

 with a kind of ring-fasoiation). 



not of two, but of four flowers in the whole structure. 

 The diagrams given of the commoner case sufficiently 

 explain themselves (figs. 78 and 79). It may be 

 mentioned that sometimes three distinct normally-con- 

 structed floAvers become separated out. 



