56 BOTANY OF CROP PLANTS 



cences: (i) simple, (2) indeterminate or racemose, and (3) 

 determinate or cymose. 



The simple type is well represented by the calla Hly or 

 tulip, in which one flower terminates the stalk. Mustards 

 and currants have a typical indeterminate or racemose in- 

 florescence. In this, the older flowers are at the base or 

 outside of the flower group and the younger appear in order 

 above them. Moreover, the growth of the inflorescence 

 may continue at the apex. For example, in a cabbage or 

 radish inflorescence, flowers may be opening at the tip, while 

 at the base pods are partially mature. Racemose types of 

 inflorescences are the true raceme, panicle, corymb, umbel, 

 spike, and head. These will be described when they are 

 met with in the family descriptions that follow. The cymose 

 flower cluster is one in which the older flowers are on the in- 

 side, and the younger appear in order toward the outside. The 

 length of a flower shoot is determined by the terminal flower. 

 The inflorescence of chickweeds is a cyme. 



