MORPHOLOGY OF REPBODUCTIVE ORGANS 113 



(fig. 220). The spikelets of plants of the Sedge Order present 

 certain peculiarities, but they are essentially of the same nature 

 as those of Grasses. 



Fie. 214. 



Fig. 215. 



Fi(j. 214. Staminate amentum or catkin of a species of 



Willow (Salix). Fig. 215. Pistillate or carpellary 



amentum of a species of Willow, with bracts between 

 the flowers. 



h. The Strobile. — This is a kind of spike formed of persistent 

 membranous bracts or scales, each of which bears at its base a 

 pistillate flower. It is seen in the Hop {fig. 216). 



The compound forms of v . tr 



the racemose type of inflo- 

 rescence include aU the mo- 

 difications of those alreadj' 

 described in which the main 

 peduncle bears secondary 

 pedtmcles instead of single 

 flowers in the axils of the 

 bracts. The following are 

 the chief varieties. 



i. ThePcmicle. — This is 

 a compound raceme, or one 

 in which the secondary 



peduncles bear racemes (fig. 217). The secondary axes may 

 themselves branch in the same way as the primary one and form 

 tertiary axes, &o., the ultimate subdivisions of which bear the 

 flowers. For an example we may take the Yucca gloriosa. 



k. The Compotmd Corymb. — This may be seen in some species 

 of Pyrus (fig. 211). It is sometimes called a pamicled corymb. 

 It differs from the panicle as the corymb differs from the raceme. 



VOL. I. I 



Fig. 216. Strobile of tlie Hop (ffiimitlifs 

 Lnpulus). 



