THE FLOWER 



143 



. Diagram ol a 

 simple cyme 

 in which the 

 axis lengtli- 

 ens, su as to 

 take the form 

 of a raceme. 



306. \Vlieievci- there are bracts or leaves, buds may be produced 

 from their axils and appear us flowers. Figure '2b2 represents the case 

 where tlie branches, hb, of Fig'. 2.51, each with a pair of small leaves 

 or bracts about their middle, have branched again, and produced the 

 branchlets and flowers, cc, on each side. It is the continued repetition 

 of this wliich forms the full or compound cyme, 



such as that of the Ilobblebush, Dogwood, and 

 Hydrangea. 



307. A Fascicle (meaning a bundle), like that 

 of the Sweet William and Lychnis of the gardens, 

 is only a cyme with the flowers much crowded 

 together. 



308. A Glomerule is a cyme still more com- 

 pacted, so as to imitate a head. It may be known 

 from a true head by the flowers not expanding 

 centripetally ; that is, not from the circumferinoe 

 toward the center. 



309. Scorpioid or Helicoid Cymes, of various 

 sorts, are forms of determinate inflorescence (often 

 puzzling to the student) in wduch one-half of the 

 ramification fails to appear. So tliat tliey may 

 be called incomplete ci/mes. The commoner forms 



may be undei'siood by comparing a complete cyme, like that of 



Fig. '252, with Fig. 251, the diagram of a cyme of an opposite-leaved 

 plant, having a S(;ries of terminal flowers 

 and the axis coiituiued by the development 

 of a branch in the axil of only one of the 

 leaves at each node. The dotted lines on 

 the left indicate the place of the ^yanting 

 ^,j_^ ^^ branches, which if present vpould convert 



i/]j^> ^ |^g;i this scorpioid cyme into the complete one 



of Fig. 252. Figure 254 a is a diagram 

 cf similar inflorescence with alternate 

 leaves. jVn axis made up in this way of a 



surcension of branches is termed a nipiipoiliuin. 



310. Mixed Inflorescence is that in which the two plans are mixed 

 or combined in compound clnsters. A mixeil panicle is one in vyhioh, 

 while the primary ramification is of the indeterminate order, the 

 secondary or ultimate is wholly or partly of the determinate order. A 

 contracted or elongated inflorescence of this sort is called a Thyrsus. 

 Lilac and Horse-chestnut affoid common examples of mixed inflores- 

 cence of this sort. When loose and open such flower clusters are called 

 by the general name of panicles. The heads of Compositte are cen- 

 tripetal; but tlie branches or peduncles which bear the heads are 

 usually of centrifugal order. 



354 



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