208 



(a) Terminology of Juvenile Leaves. 

 The general subject is not frequently referred to in books published in Europe, 

 .probably because the contrast between juvenile and mature foliage is vastly less 

 noticeable than in Australia, where Eucalyptus is so abundant. The following table 

 shows some of the terms found in botanical literature : — 



Juvenile leaves 



Young leaves. 



Seedling leaves. 



Cotyledon leaves = Opposite leaves (of old 

 writers). 



(partly) First leaves 

 above the cotyledons 

 (Naudin). 



First leaves (Naudin ; 

 Kerner and Oliver). 



= Primary leaves 

 (Lubbock). 



Leaves of adventitious shoots (Bentham.) 



= Sucker leaves 1 (of the Australian 

 public). 



= Leaves of reversion shoots (Goebel). 



= Primary leaves (Diels). 



= Juvenile leaves (J.H.M.) 



= Abnormal leaves 2 (R. T. Baker). 



= Adventitious leaves (R. H. Cambage). 



1 Sucker leaves in Europe are, in strictness, those which are on shoots which spring from below the ground. 



2 We do not speak of a child or young of any animal as being abnormal simply on account of his youth. 



[Diels' s Law.— Juvenile leaves may appear at any part of the plant and carry 

 on the cycle of life up to the fruiting stage. It is merely referred to at this place, as 

 it has been somewhat fully dealt with at Part LVI, p. 303.] 



(b) Coloured Plates. 



It may be convenient to anticipate briefly some of the coloured plates (not yet 

 published). 



If we take E. eugenioides (Plate 1, Figs. A-E), E. globulus (Plate 1, Pigs. F-I) 

 and E. Flocktonice (Figs. 133-135), where we have reproduced the principal phases of 

 the seedling, it is obvious to a tyro that we have a perfect correlation between the 

 seedlings, and the ordinary juvenile and intermediate (sucker) leaves of the tree. 



Compare these coloured figures with, as regards — 



E. eugenioides, figs. 1-2, Plate 39, Part VIII; 2a, 4a, 4b, 10a, and 15a, Plate 40; 

 Part VIII. 



E. globulus, figs. 1, 2a, Plate 79, Part XVIII. 



E. Flocktonice, Plate, 236, Part LVIII fig. 3a, Plate 243, Part LIX; fig, 1, Plate 

 267. Part LXV. 



