BY R. H. CAMBAGE. 711 



commonly assumes the mallee-form. E. Morrisii is found taking 

 the highest ridges. 



Turing south-easterly from the gold mines near Mount Boppy, 

 through Geweroo and Trowell Creek stations to the Nyngan and 

 Nymagee road, we pass Acacia excelsa, Callitris robusta, Eremo- 

 phila Mitchelli, and Tecoma australis, R.Br., a climber often 

 called Bignonia, with a beautiful white bell-shaped flower. In the 

 month of May this creeper is in full flower, spreading over the 

 trees on the ridges, and has a most attractive appearance. 



Near here are hills of igneous formation, the first so far noticed, 

 and it is interesting to mark any change in the vegetation. 



On a ridge of quartz felspar porphyry we expect to find 

 Eucalyptus Morrisii, as it has been found in all similar situations 

 on hills of sedimentary origin. However, we look here in vain, 

 but in its place is E. dealbata, A. Cunn. This is the most north- 

 westerly locality in which I have ever found this species. There 

 has been some difference of opinion among botanists as to whether 

 this is a distinct species or only a western form of E. tereticornis. 

 My observations are that E. tereticornis grows all along the coast 

 north and south of Sydney, and that typical trees extend westerly, 

 missing the higher Triassic sandstone of the Blue Mountains, but 

 occurring again on the Devonian, Silurian, and igneous formations, 

 in various situations on high and low land, but chiefly good soil, 

 right out to Orange. A f ter passing Molong, it is usually confined 

 to the valleys. Here E. dealbata makes its appearance, on hills 

 of Devonian sandstone, and this tree continues right out to Mount 

 Hope, and possibly beyond, capping hills of Devonian sandstone 

 and quartzite, Silurian slate, and igneous formation with consider- 

 able impartiality, but invariably taking the high land. It has an 

 extensive range north and south. Where the formation is granite 

 one of the species is sure to be represented. 



E. tereticornis follows for some distance keeping the low land, 

 but ceases long before E. dealbata. The former is known as 

 Forest Red Gum, and the latter as Mountain and Cabbage Gum, 

 though this last name is more often applied to E. hcemastoma, 

 Sm., a white brittle gum which grows on the Silurian slate ridges 



