186 



MIXED INFLOEESCENCE. 



a", ending in a flower/'", takes origin. In this case the axes are 

 arranged, not in two rows along one side of the false axis, but are 

 placed at regular intervals, so as to form an elongated spiral round it. 

 In the Bell-flower (Campanula), (fig. 276), there is a racemose uni- 

 parous cyme, developed in a very irregular manner, and giving rise to 

 a peculiar mixed inflorescence ; a' a' is the primary axis, ending in a 



Kg. 275. 



Kg. 276. 



flower, /', which has withered, and giving off secondary axes, a" a", 

 each terminated by a flower, and developed centripetally, the lowest 

 being most expanded. In Streptocarpus polyanthus, and in several 

 calceolarias, we probably have examples of compound definite inflores- 

 cence. Here there are scorpioid cymes of pairs of flowers, each pair con- 

 sisting of an older and a younger flower. 



Mixed Inploebscence. — Forms of inflorescence occur, in which ' 

 both the definite and indefinite types are represented. Thus, in Com- 

 positae, such as Hawkweeds (Hieracia), the heads of flowers, taken as a 

 whole, are developed centrifugally, the terminal head first ; while the 



Kg. 276. False raceme or helicoid cyme of a species of Alstromeria. a' a" a'" a"". 

 Separate axes successively developed, which appear to form a simple continuous raceme, of 

 which the axes form the intemodes. It is a definite uniparous inflorescence, however, with 

 centrifugal evolution. Each of the axes is produced in the axil of a leaf, and is terminated 

 by a flower, /' /" /'" /"", opposite to that leaf, and the axes have a spiral aiTangement. Fig. 

 276. Uniparous racemose cyme, or cymose raceme of Campanula, a', Primary axis, termi- 

 nated by a flower, /', which has already withered, and is beginning to pass into the state of 

 fruit, a" a" a". Secondary axes, each tenninated by flowers, /", which are more advanced 

 (the lower they are in their position. 



