34 



OEGANOGRAPHY AND GLOSSOLOGY. 



In every inflorescence the flowers are solitary (fl. solitarii), when each peduncle 

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

 normal leaves (Pimpernel, fig. 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. 



I. 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, 



133. Mignonette. Simple panicle. an( J ca U e( J a panicle (pani- 134 ' Yucca Glorloea. 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 umbeUutae 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, 



