BY DR. M. B. BORKHAUSEN. 1Q.T, 



Every unbiassed observer, however, comparing 

 both plants in nature, will find, that Linnaeus 

 was . perfectly in the right ; they very gradually 

 run into one another, and it frequently happens 

 that both these varieties are found upon the same 

 stalk. 



5. Pimpinella Saxifraga Linn, and P. dissecta 



Retz. & Roth. 



Linnaeus united both plants under the common 

 name of Pimpinella Saxifraga; RETziusand Roth 

 separated them, and endeavoured to find a specific 

 difference in the root-leaves. But in observing 

 these plants at a spot where they grow in abun- 

 dance so many gradations and varieties offer with 

 regard to habit, proportion and partition of the 

 leaves, as to make often utterly impossible to 

 decide, whether a specimen belong to Pimpinella 

 Saxifraga or P. dissecta. I myself saw the root- 

 leaves of the following plants. 



a. pinnate : leaflets roundish, acutely serrated. 



b. pinnate : leaflets roundish, gashed. 



c. pinnate: leaflets pinnatifid. 



