240 PRINCIPLES OF PLANT-TBEATOLOGT. 



two flowers which normally occur side by side in 

 Ganna : in this dual flower there were 7 sepals, 5 

 petals, 6 alse, 2 labella, 1 normal stamen ; the peta- 

 loid portion of the other stamen is notched and bears 

 a ridge which near the anther ends in a free lobe. 

 There were two styles, one normal, the other filiform. 

 The ovaries were simply united along one side only. 



Migliorato described instances of concrescence of 

 flowers in the inflorescence of the gum-tree {Euca- 

 lyptus salicifolia and E. viminalis), etc. (PI. LI, figs. 4 

 and 5). In the genus Syncarpia, belonging to the same 



Fio. 146. — Pedicularis sylvatica (Lousewort). Diagram of normal 

 separate flower, b, bract ; s, sepals ; P, upper lip ; p, petals ; a,, 

 stamens ; d, disk. (After Wigand ) 



section of the Myrtacege, the flowers are normally 

 concrescent, forming a solid mass. In Eucalyptus 

 cornuta they form a very compact aggregate, and are 

 in part concrescent, but not completely so. In most 

 species they are completely free. 



Synanthy occurs as a normal phenomenon in the 

 genus Lonicera (honeysuckle). Arber has investigated 

 this, and to his paper _ the reader is referred for 

 further details. It is a case of partial synanthy, inas- 

 much as the ovaries only of the two lateral flowers of 

 the dichasial cyme are united (to form a false berry), 

 the entire upper part of the flowers being free. This 

 we know to be due to union and not division, for, by 



