300 
H. F. Weriiham. 
Tubiflorae which have only two ovules to each carpel (Lamiales); 
these we shall name Diovulatce. A branch-line, leading to the 
Boraginaceae, left this latter line early, in a way closely analogous 
to that of the Hydrophyllaceae-branch of the “ multiovulate- 
zygomorphy ” line. In the inflorescence character, moreover, these 
diovulatae 
[Lamiales .] 
Diagram shewing possible affinities of the Transitional Group and its 
connection with the higher groups of Tubiflorae. The two thick lines 
represent the tendency to Zygomorphy. 
two orders reflect one and the same tendency—a case, we must 
regard it, of parallel development; this is so indicated in the 
accompanying diagram, in which is summarized the foregoing sketch 
of the relationships of the orders concerned. 
There remain for consideration the Polemoniaceae. We have 
already referred to these as forming the only extensive exception 
