206 



In some of the rarer species we do not know whether we have the ultimate growth 

 or not, and in many cases we are sure we have not. How difficult it therefore becomes 

 to make deductions ! Often we have not leaves from the tops of the trees (in this 

 position the leaves are often smaller and narrower), but from lower down, because 

 easier accessible. 



It is probable that in some species in which we have not hitherto found lanceolate 

 leaves, we shall find them later, since we have found such leaves in a few species as the 

 result of special search. There is a direct tendency to reduce the number of species 

 with non-lanceolate leaves. Part LVII, pp. 412, 413, may be referred to in this 

 connection. It is possible that, in the case of a few of the less-known species, it may 

 be that a species with leaves non-lanceolate, or preponderatingly so, is conspecific 

 with a form of which we only know lanceolate leaves. 



6. Correlation of Seedlings and Juvenile Leaves. 

 (Adventitious Shoots.) 



(a) Terminology of juvenile leaves. 



(b) Coloured plates. 



It may be convenient at this place to interpose a few notes on the correlation 

 of seedlings and juvenile leaves (adventitious shoots). Later on the seedlings will be 

 described in individual detail (as the leaves have been), when the coloured plates, neces- 

 sary to elucidate them, become available. 



The puzzling variation in the shape, texture, vestiture, etc., of seedlings, has a 

 direct counterpart in the juvenile and intermediate leaves of the tree. This correlation 

 is most important. Bushmen have known of it for very many years, even before 

 botanists appear to have formally recorded it. Here are a few notes by botanists : — 



Pasquale, G. A., 1867. ' These adventitious buds enclose the new shoot, 

 which repeats the primitive form of the young plant in everything that it has produced 

 above the cotyledons . . ." (Quoted by C. De Candolle, see Part LII, p. 91.) 



Mueller, F. (Fragm., II, 1869) has a brief note on the subject (quoted at Part 

 LVI, bottom of p. 282). 



Planchon, J. E., 1875. See remarks on polymorphism in E. globulus, quoted 

 at Part LII of this work, p. 89. 



Briosi, G. A., Milan, 1891. Quoted by C. De Candolle and others at Part LVI 

 p. 287, of the present work. 



De Candolle, C, 1903. " E. globulus. It is known (his own observations 

 were made at Cannes in 1889) that the trunk of this tree frequently produces adventitious 

 shoots, with the branches and the leaves having the juvenile form so characteristic of 

 the species. The fact has been known for a long while." He then quotes Pasquale 

 and Briosi. (This work, Part LVI, p. 287 



