THE BOOT 



43 



become lirmly glued to the surface. Firm .support is tlius 

 afforiled to tlie ascending' creeper. 



64. Roots used for storage. — The roots 

 of almost all plants that 

 persist for more than a 

 single season serve, in 

 common with the stem, 

 as organs of storage, to 

 Some extent. But their 

 forms are not altered 

 for the special purpose 



A SMcliuii tliri)iii;U 

 Dodck'i- airiUiost 

 plant at llio 

 point "where the 

 huustorium, cir 

 sucker, of the 

 former pene- 

 trates the hark 

 of the host ; //, 

 stem (if the jiara- 

 site; s, suckei', 

 piercing: to the 

 woodof theliost, 

 h (much magni- 

 fied). — Sachs. 



?A 



fvools of Trnni- 

 pet Creeper, 

 used in climb- 

 ing. 



Thickened storage roots iu 

 cultivated plants. On the 

 left Carrot, on tiie right 

 Radish, fn both cases the 

 root iscontlnentaljove with 

 an cxecctlingiy shortened 

 stem bearing the leaves. 



of storage in ordiiraiy cases. Yet roots are sometimes 

 much enhirged to hold the nourishifient made by the 

 plant during one growing season for its use in tlie next. 

 Among the plants that owe their early ap[)earaiice iti the 

 .spring to food stored up in a somewhat fleshy root is the 

 Dandelioii (Fig. ■!-)■ In certaiit jjlauts the tendency to a 

 thickening of the root has beeti fostered liy cultivation 

 and selectiofi ixntil from the original wild stock, not more 

 promising in the beginnifig thati some of our common 

 herbs, such useful food plants as the IJeet, 'Furnip, Farstiip, 

 and Radisli have been produced. These make use of 



