344 



TEXTBOOK OF PLANT PHYSIOLOGY 



has been proved by numerous experiments. The life of many 

 plants may be considerably prolonged by removing their floral 

 buds and thus preventing fruiting. By this method it is possible, 

 for instance, to make an ordinary garden mignonette live 2 or 3 



<fe*S$S 





Fig. 142 





Fig. 143 



Fig. 142. — Stages in development of the wild carrot, a biennial plant. On the left 

 the seedling; in center, plant at the end of first growing season, having formed a 

 fleshy root. On the right, a mature and blooming specimen in the middle of the 



second year (after Transeau). 

 Fig. 143. — Century plant (Agave) showing rosette of fleshy leaves and flowering 



stalk (after Transeau). 



years instead of one year (as has been done by Molisch). It 

 will then acquire the form of a small shrub. On the other hand, 

 when biennial plants, for some reason or other, produce seeds 

 during the first year, the so-called shooting of beets and other root 

 crops, then their vegetative organs will die promptly. 



