OF THE CARPELS. 257 
rence has also been frequently noticed in the Columbine 
and also in Orucifere and Umbellifere. M. Germain de 
St. Pierre mentions an instance wherein the carpels of 
Salix Babylonica were converted into two leaves, pro- 
vided with stipules. All the flowers of the catkins 

Fia. 137.—Rose, in which the axial portion of the flower was elon- 
gated and the carpels were more or less replaced by leaves. 
17 
