DICOTYLEDONS: RO SALES. 68 1 



The members are trees or shrubs. The receptacle is some- 

 what cup-shaped and hollow. The perianth and stamens are at 

 first perigynous, but become epigynous (upon the gyncecium) 

 by the fusion of the receptacle with the carpels. The floral 



Fig. 569. 



Choke-cherry (Prunus virginiana). Leaves, 

 flower-raceme, and section of flower at right. 



formula is thus Ca5,Co5,Aio-5-5 or 10-10-5,01-5. The carpels 

 are united, but the styles are free. In fruit the united carpels 

 fuse more or less with the receptacle. 



SUGGESTIONS FOR STUDY OF THE APPLE. 



1173. The apple (Pyrus malus). 



Leaves. Determine the arrangement of the leaves on the shoot; sketch 

 a leaf. 



The inflorescence. Determine the kind of inflorescence. 



The flower. Study several flowers to compare the variation in the 



