BY R. H. CAMBAGE. 61 



usually sessile fruit of E. dealbata, and the pedicellate domed 

 fruit of E. tereticornis. In the forest one is often assisted in 

 separating the two species by the very glaucous foliage and buds 

 of the former, and often by its drooping habit. Its timber is 

 also inferior to that of E. tereticornis. E. dealbata undoubtedly 

 seems to favour a western influence, and elevated or ridgy land; 

 and a knowledge of its habits is often unconsciously used as an 

 assistance in its identification. Around Emmaville the two 

 trees are growing side by side, but there is rarely any difficulty 

 in separating them by a general inspection. Probably this is 

 another instance of two closely allied trees having had a common 

 origin, and, owing to certain conditions of environment, have 

 gradually developed differences which may perhaps now be 

 regarded as sufficient to entitle each to specific rank. It is 

 noteworthy that there is probably no species of Eucalyptus with 

 more forms possessing features which just barely bestow tho 

 right to specific rank than E. tereticornis. 



It may be pertinent to point out that in considering the 

 relationship of species and varieties among native plants, it is 

 customary for the botanist to regard the form which happens to 

 have been first discovered and described as the species or type, 

 and those which may have been found later as varieties, without 

 any reference to the question as to which of them may naturally 

 be more closely related to the original form. It is therefore 

 highly probable that some of the botanist's so-called species may 

 be merely later forms which have been evolved from an older 

 stock, though the latter now happens to be styled a variety. In 

 New South Wales, therefore, the botanist's varieties are generally 

 found in localities remote from Port Jackson, whence many of 

 the types came. 



Just north of Tent Hill, on the fairly open hillside among E. 

 dealbata and E. albens, Jacksonia scoparia was very abundant^ 

 being quite a feature in the landscape. 



The trees of Casuarina Cunninghamiana along the banks of 

 Glen Creek were the only River Oaks noticed within the area 

 described, and the species would probably be more abundant at 

 lower levels. 



