person would appear to be the blossom. Yet M. A. 

 Richard maintains that all the six form nothing but a 

 flower- cup, and that the blossom is wanting. In a 

 similar manner he explains the structure of the flower 

 of the orchis. What again is popularly supposed to 

 be the lilac or blue blossoms of the hydrangea, are 

 shown by De Candolle not to be even the flower-cup, 

 but merely floral leaves or flower scales. 



It has been proposed, when there is only one enve- 

 lope in a flower, to call that the cup, whether it be 

 coloured or not ; and when two, to call the outer the 

 flower-cup and the inner the blossom. When the 

 flower-cup and blossom have several divisions or leaves, 

 these always alternate, and consequently correspond in 

 number. In water lilies there are more than two 

 whorls, and in the passion flower the numerous thread- 

 like petals within the outer whorl are of this kind. 



Blue Passion Flower. 



