CONVOLVULACE^: 



357 



certain other plants usually on the tops of little rises 

 of the sand kept by it from being blown away. 



I. PES TIGRIDIS, L. is another seashore plant with 

 palmately lobed leaves (like a tiger's spoor). 



FIG. 80. EVOLVULUS ALSINOIDES, L. 



I. BATATAS, Lamk. is the Sweet-potato plant. 



The 



roots swell into tubers which contain sugar as well 

 as starch, and are edible (p. 115). 



EVOLVULUS ALSINOIDES, L. is a small herb with 

 bright blue flowers, a quarter of an inch in diameter, 

 which is very common amongst grass in sandy and 



