126 



ELEMENTS OF STRUCTURAL BOTAKY. 



upper ones, so that all the blossoms are nearly on the 

 same level, the cluster is a corymb (Fig. 170). If the 

 flowers in a head were elevated on separate pedicels of 

 the same length, radiating like the ribs of an umbrella, 

 we should have an umbel, of which the flowers of 

 Geranium and Parsnip (Fig. 51) are examples. A 

 raceme will be compound (Fig. 171) if, instead of a 

 solitary flower, there is a raceme in each axil, and a 

 similar remark will apply ?n the case of the spike, the 

 corymb, and the iJmbel. 



190. The inflorescence of most Grasses is what is 

 cfiUed a panicle. This is a coinpoimd form, and is 



Fiff. 172. 



usually a kind of raceme having its primary divisions 

 branched in some irregular manner. 



191. Of determinate inflorescence the chief 



modification is the cyme. This is a rather flat-topped 

 Fig. 172.— A cyme. (Gray.) 



