STRUCTURE.] 



NECTARY CORONET. 



837 



Nymphsea, Nuphar, Magnolia, &c. It sometimes happens 

 that, if there is more than one row of petals, all within the 

 first row assume a different appearance from the first ; the 

 filamentous processes of the crown of Passiflora are apparently 

 of this nature. 



The petals are often furnished with little appendages 

 (fig. 105.), which are either inner rows of petals in a state 

 of adhesion to the first row, or modified stamens ; which of 

 the two it is sometimes difficult to ascertain. Many of these 

 enter into Linnaeus' s notion of nectarium, although nearly 

 the whole of them are destitute of any power of secreting 

 nectar or honey. 



100 



101 



104 



105 



The most common form of appendage is the coronet or 

 corona, which proceeds from the base of the limb, forming 

 sometimes an undivided cup, as in Narcissus (fig. 104.), 

 when it becomes the scyphus of Haller ; sometimes dividing 

 into several foliaceous erect scales, as in Silene and Brodisea, 

 when it forms the lamella of some writers ; occasionally appear- 

 ing as cylindrical or clavate processes, as in Schwenckia and 

 Tricoryne, where it is manifestly modified stamens ; and even 

 in some instances forming a thick solid mass covering over 

 the ovarium, and adhering to the stamens, as in Stapelia, 

 when it is called the orbiculus. Parts of this last form of 

 coronet bear several names, which are found useful in avoid- 

 ing repetition when describing the complicated structure of 



VOL. i. z 



