204 



ORGANOGRAPHY. 



only one of which, (i.e. that on the same side with the first,) 

 produces a tertiary axis <?, also terminated by a flower with two 

 bracts at its base, one of which gives origin to another axis d, 

 placed in a similar manner, and so on. The place of the axis 

 which is undeveloped at each ramification is indicated by a dotted 

 line. In consequence of this one-sided (or as it is called secund) 

 manner, in which the secondary branches are produced, the 

 direction of the inflorescence is constantly drawn to one side 

 at the formation of each axillary branch, and that in propor- 

 tion to the size of the angle formed by it with the branch 

 from which it springs, and thus when the angle is large, and 

 many flowers are produced in succession, the upper extremity 

 becomes completely coiled up in a circinate manner. In a 

 plant with an alternate arrangement of its leaves or bracts, 

 the helicoid cyme arises from the primary axis {fig. 416), 



Fig. 416, 



Fig. 415. 



Fig. 415. Diagram to Illustrate the formation of a scorploid cyme in a plant 

 with opposite bracts or leaves, a. Flower terminatincr tlic primary axis. 

 h. Secondary axis. c. Tertiary axis. d. Quaternary axis. Eacli terminated by a 



flower. F)g.i\&. Diagram to illustrate tlie formati.m of a scorpioid cyme 



in a plant wifii alternate bracts. The figures represent tlie respective axes, and 

 the dotted lines below the flowers the position of the bracts. 



being terminated by a flower, and giving off below it from the 

 uppermost bract or leaf a secondary axis 2, which al^^o terminates 

 in a flower, and gives oif below it in like manner from the same 

 side as the former a third axis 3, which also terminates in 

 a flower, and so on, as seen by the figures. The place of the 

 bracts is indicated by the dotted lines below the flowers. 

 Hence, such a cyme consists of a series of single-flowered axes 

 (unifloral) arranged in the form of a raceme, to which kind of 

 inflorescence it is by some botanists considered to belong. When 

 the bracts are developed, however, there ought to be no difficulty 

 in distinguishing it, as in the ordinary raceme the flowers 

 always arise from the axil of the bracts, whereas in the helicoid 

 cyme they are placed opposite to the bracts, or at all events out 



