ROOTS 



13 



gloxinias, and bryophyllum. In the black-cap raspberry 

 and in dewberries, a shoot (stem) may bend over by its own 

 weight, and where it strikes the ground, develop adventi- 

 tious roots, and thus secure a foothold. When once the 

 tip has rooted well, the stem may be cut loose from the 



GROUND 



L.I NE 



.\::;\ 





Hcf-- 



Fig. .\. — Tap-root system of youny^ sugar beet. (Maxsou.) 



parent stem and such rooted ti[).s used as "sets." Straw- 

 berries produce slender stems, called runners. Adventitious 

 roots may be produced at the nodes. 



A very different sort of root system develo[)s in such plants 



