ORGANOGEAPHY AND GLOSSOLOGY. 



In every inflorescence the flowers are solitary {fl. soUtarii), when each peduncle 

 is undivided, and springs directly from the stem, and is isolated from the others by 

 normal leaves {Pimpernel, flg. 30). Inflorescence, 

 in its restricted sense, consists of a group of pedi- 



celled flowers, bracteate or 



not, all springing from a 



common peduncle which 



bears no true leaves. 



Indefinite inflorescences 



are — the raceme, corymb, 



umbel, spike, and head. 



1. The raceme [race- 



mus) is an inflorescence 



of which the nearly equal 



secondary axes rise along 



the primary axis ; it is 



simple, when the pedicels 



spring directly from the 



primary axis, and terminate 



in a flower {Lily, Lily of the 



Valley, Snapdragon; Cur- 

 rant, fig. 132 ; Mignonette, 



fig. 133) ; it is compound, 



138. Mignonette. Simple panicle, and Called a lOawicZe (vani- 131. Yucca Gloriosa. Branch of compound panicle. 



cula), when the secondary axes branch once or oftener before flowering {Yucca 

 Gloriosa, fig. 134). A thyrsus {thyrsus) is a panicle of an ovoid shape, the central 

 pedicels of which are longer than the outer ones. 



135. Cerasus Mahaleb, 

 Indefinite corymb. 



136. Cherry. Simple umbel. 



137. Fennel. 

 Umbel and umbellul£e without involucre. 



2. The corymb {corymbus) resembles the raceme, but the lower pedicels are so 

 much longer than the upper, that the flowers are nearly on a level {Cerasus Mahaleb, 



