154 



ZUSSO^S WITB PLANTS 



173. Having disposed of the three bracts, we 

 now ask if the colored parts above them are 

 sepals or petals. There is nothing in the flower 



Fig. 154. 

 Flowers of the flowering-dogwood. 



to help US in answering the question; we there- 

 fore follow the custom of botanists, and say that 

 when either floral envelope is wanting, it is the 

 corolla (unless there is some special reason to the 

 contrary). This is, generally, an arbitrary definition, 



