Origin arid Development of the Composite ?. 125 
7, Chap. II and modified in Chaps. III-IV. This, it should be noted, 
is with the uniseriate pericline and slightly developed calyculus 
taken as the primitive type of involucre, a view which derives strong 
reciprocal support from the fact that with this hypothesis the 
involucre slows an evolution essentially similar to that of the other 
characters of the capitulum. 
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