DISTRIBUTION AND ADJUSTMENT 91 



contrast between the deeper parts of lakes and their surface 

 waters. But there is a seasonal distribution of both plants and 



FIG. 55. Spring flowers of the forest floor: Upper left, spring beauty, Claylonia 

 wrginica; upper right, toothwort, Dentaria laciniata; lower left, Dutchman's- 

 breeches, Dicentra cucullaria; lower right, yellow adder's-tongue, Erythronium 

 americanum. 



