Five-leaved Clover 343 



we obtain a crown of six or seven leaflets on one 

 stalk. Such were often met with in the race I 

 had under cultivation, but as a rule it did not ex- 

 ceed this limit. 



The same phenomenon of a lateral doubling 

 of leaflets may of course be met with in other 

 instances. The common laburnum has a va- 

 riety which often produces quaternate and 

 quinate leaves, and in strawberries I have also 

 seen instances of this abnormality. It occurs 

 also in pinnate leaves, and complete sets of all 

 the intermediate links may often be found on 

 the false or bastard-acacia (Robinia Pseud- 

 Acacia). 



Opposed to this increase of the number of 

 leaflets, and still more rare and more curious is 

 the occurrence of " single-leaved " varieties 

 among trees and herbs with pinnate or ternate 

 leaves. Only very few instances have been de- 

 scribed, and are cultivated in gardens. The 

 ashes and the bastard-acacia may be quoted 

 among trees, and the * ' one-leaved ' ' strawberry 

 among herbs. Here it seems that several leaf- 

 lets have been combined into one, since this one 

 is, as a rule, much larger than the terminal leaf- 

 let of an ordinary leaf of the same species. 

 These monophyllous varieties are interesting 

 also on account of their continuous but often in- 

 complete reversion to the normal type. 



