PLANT CLASSIFICATION 



157 



the stems and leaves above ground die ; but if this root re- 

 mains in the ground or is planted the next season, stems, 

 leaves, and flowers develop rapidly, and finally seeds are 



FIG. 81. Carrot. A, young seedling; B, enlarging root early in season; 

 C, section of enlarged root late in season. 



formed, the food stored up the preceding season being drawn 

 upon for the development of these parts. Plants which have 

 a life history like this and which live for two years only are 



