78 



PLANTS 



but the upper, exposed surface, has the stomata and an epider- 

 mis Hke that of the mesophytes. These plants grow only in 

 quiet, shallow water. They are firmly rooted in the mud, 



Fig. 37. — Salicornia ambigua, a xerophytic plant found in salt marshes and 

 sandy beaches of the Atlantic sea-board. The leaves are rudimentary. X1/2. 



from which the long stout petioles rise at an angle to the surface, 

 where the broad leaf blades spread out in a single plane. These 

 conditions allow the leaf to rise and fall with every change in 



