44 



BUDS AND STIPULES 



by a thick coat of felted hairs ; this is the case in 

 V. Lantana. Another plan would be that the outer 

 leaves should become leathery, and thus protect the 

 inner ones ; this is the case with V. Opulus. But that 

 being so, it is an advantage that the inner or true 

 leaves should be folded, because they thus occupy less 

 space. This, perhaps, accounts for the folding of the 

 leaves of V. Opulus in the bud, while 

 the lobes follow from the mode in which 

 the leaves are folded. Now a leaf folded 

 up, as are those of V. Opulus, requires 

 only two or three lateral veins. The 

 remaining veins, then, and the mem- 

 brane connecting them, will gradually 

 be reduced, and ultimately disappear. 



In V. Opulus, as is shown in the 

 figure (fig. 57), there is a space left be- 

 Viburnum Opu- tween the bases of the leaves. In the 



L, Tlltert; lobes of S **' """^ S P edeS f wMch 



ISxt yoimger pair have leaves somewhat resembling those 

 i>uie. aves ' Sf ' st " of V. Opulus, this space is fully oc- 

 cupied by the following pair of leaves. This, how- 

 ever is not the case in V. Opulus, and the space thus 

 left unoccupied is filled up by the stipuliform append- 

 ages. I may also observe that the stipuliform append- 

 ages resemble leaf- lobes in being slightly conduplicate. 

 These considerations seem to throw some light on 

 the differences between the leaves of Viburnum Lantana 



