90 



COLLEGE BOTANY 



minate group the buds begin to bloom at the base of the axis, 

 while in the cymose or determinate group the buds at the tip 

 of the axis are the first to bloonu 



In the raceme the flowers are arranged along an elongated 



axis, and there is a small leaf- 

 like structure or bract at the 

 base of each flower. Common 

 examples are the lily of the 

 valley, the wild cherry and the 

 currant. Sometimes the ra- 

 cemes are branched and there- 

 fore known as comipound ra- 

 cemes, as in the case of the false 

 SolomoU's seal. 



The panicle is a loose, com- 

 pound, somewhat irregular 

 raceme, such as is found in the 

 oat and some of the grasses. 



The thyrsus is a compact 

 pyramidal panicle, such as is 

 found in the lilac and the horse 

 chestnut. 



The corymb is a raceme 

 with a somewhat shortened axis 

 and in which the peduncles 

 {i.e., stem for each flower) of the lower flowers are elongated 

 so as to bring all the flowers on about the same level, as in the 

 case of the mountain ash. 



The umbel has such a very short axis: that the peduncles ap- 

 pear to arise from the same point, as in the case of the milkweed 

 and the wild carrot. We also find the compound type of umbel. 



Fia. 69. — Indian turnip or Jack-in-the- 

 pulpit; (a) bulb; (6) leaf and spathe; (c) 

 spathe open to show spadix and newer near 

 the base. 



