21 



" Now the delicate green primary suckers are to be regarded as indicating the true phylogenetic 

 relationship, whilst the coarse, glaucous secondary suckers suggest an adaptation of such sucker growth 

 by the development of xerophytic structure, to environmental conditions unsuitable for the existence 

 of thin green leaves of the E. Dixsoni type. The distribution of E. Dixsoni seems to be determined by its 

 water requirements, and that it is restricted to zones of critical soil humidity. E. Dixsoni is found at higher 

 altitudes on drier soils. The conclusion, therefore, that the E. dives-like sucker is but a structural 

 adaptation in response to the impress of more xerophytic conditions seems not unreasonable." 



Named in honor of the late Sir Hugh Dixson, Abergeldie, Ashfield, New South 

 Wales. (End of Mr. "Wakefield's remarks.) 



AFFINITIES. 



Besides the affinities already discussed by Mr. Wakefield, it appears to me ( W.F.B.) 

 that E. Roberts oni bears a rather close relationship to E. Dixsoni in the shape and colour 

 of the juvenile and adult leaves, and also in the shape of the buds and fruits. The latter 

 characters are so much alike that it is sometimes difficult to discriminate between them. 

 The much broader juvenile leaves of E. Dixsoni, however, separate it from E . Robertsoni . 

 The arboreal characters of both species are also dissimilar, and also the timbers. 

 E. Dixsoni may be regarded as a far inferior timber tree to E. Robertsoni. 



With E. dives Schauer. 



It is quite obvious that E. Dixsoni is more closely allied to E. dives in all its 

 botanical characters than to any other species, and in imperfect specimens one would 

 say they are conspecific. It is interesting to note, also, according to Mr. Wakefield^ 

 that the oil of E. Dixsoni is nearly of the same constituent as that of E. dives. It contains 

 a large quantity of phellandrene. And, on the other hand, according to the same 

 authority there are no plants of E. dives associated with E. Dixsoni. 



With E. radiata Sieb. var. latifolia Baker. 



I have not had the opportunity of closely examining this variety, and from the 

 very imperfect description it would appear to be closely allied to it in the broad leaves, 

 in fact, it may be conspecific with it. 



