ROSACEA 



349 



are borne. The calyx is free from or grown to the ovary, 

 five-lobed, and sometimes subtended by a set of bracts 

 (epicalyx, as in strawberry). The petals are distinct, as 

 many as the lobes of the calyx and inserted on the margin of 



rece'pkcle 

 drupeki 



ca^K lobe 



■6li^ma 



Fig. 147. — American red raspberry (Rubus strigosus). A, median lengthwise 

 section of flower, X 4; B, same of fruit, X 4; C, single immature pistil, X 5- 



the disk (Fig. 147). This disk is an outgrowth of the recep- 

 tacle and forms a flat rim about the calyx base. In cultivated 

 roses there are numerous petals which have developed from 

 primordia that normally become stamens. This bears out the 



