MONOPODIAL BRANCHING. 101 



But if the terminal bud, though produced, ceases 

 to grow, while the lateral buds are vigorously developed, 

 as is well exhibited in the spring by the annual shoots 

 of the Lilac, then it is clear that the 

 branches will overtop the original stem, 

 and the latter will finally become unreeog- 

 nizable. 



143. The Pine and the Spruce and 

 similar forms are said to be racemose or 

 botryose, and the Lilac, in the development 

 of its annual shoots, is said to be cymose. 

 Fig. 127 is a representation of the latter 

 mode. Here 1 is the extremity of the 

 main stem, but the terminal bud at that 

 point has failed to grow, while two vigor- 

 ous branches have been produced. The 

 terminal buds of these branches (2 and 2), 

 have in their turn failed, and the laterals 



Fig, 129. 



immediately behind them have, as before, 

 given rise to new shoots. This is the result, then, when 

 both the lateral buds grow with equal vigour, and it is 

 known as a forked cyme. 



144. But sometimes one member of each pair of buds 

 is developed far more strongly than the other. If the 

 strong buds are developed in succession on the same side 

 of the stem an effect will be produced like that represented 

 in Fig. 128. This is known as a helicoid cyme. If, 

 however, the strong buds are developed alternately on 

 both sides of the stem, we get the form shown in Fig. 

 129, which is then called a scorpioid cyme. Not un- 



Fig. 129. Diagram to illustrate scorpioid cyme. (Sachs.) 



