554 NOTES ON THE NATIVE FLORA OF NEW SOUTH WALES, Vlll., 



this species is common throughout the coastal districts, north 

 and south of Sydney, it has a limited range in a westerly 

 direction, never ascending far into the mountain-area. There 

 are few Eucalypts whose lateral roots protrude above the 

 surface of the ground more than those of E . pilularis. 



E . Deanei is first seen about a mile or so west of The Oaks, 

 just before the margin of the shale is reached, and occurs 

 again near the descent into the Burragorang Valley. It is 

 known as Blue Gum, and gives rise to the name of the creek 

 which flows from Picton Lakes into the Nattai River. Blue 

 Gum Creek is the most southern locality recorded for the 

 species, but it extends northerly to northern New England, 

 crossing at Deepwater, to the western side of the Great 

 Dividing Range, though as a somewhat dwarfed tree known 

 as Brown Gum. Although it continues down the Burrago- 

 rang Valley, below the junction of the Nattai, and with its 

 beautiful white boles, is one of the most majestic trees in the 

 locality, it does not appear to extend up the Wollondilly above 

 the Nattai Junction, owing perhaps partly to the change of 

 geological formation, after a few miles, from sedimentary to 

 igneous (felsiticj, but probably chiefly because of the exposure 

 of this upper area to westerly influence ; for, owing to the 

 great amount of denudation up the river and on the western 

 side, the country is more exposed to the cold and drying 

 effect of westerly gales. E. Deanei flourishes best under an 

 eastern rather than a western aspect, and it is only in the 

 extreme north, where the atmospheric conditions are tempered 

 by the increased warmth of northern latitudes, that it seems 

 able to cross to the western side of the Main Range. 



E. corymbosa, the common coastal Bloodwood, is confined 

 to the sandstone as is usual. There is scarcely any species of 

 Eucalyptus with a more definite partiality for sandstone 

 (siliceous formation), and an aversion for shale or slate areas, 

 than E. corymbosa; and if it be found growing on the Wiana- 

 matta Shale, the proximity of sandstone and the thinness of 

 tlie shale, may be confidently deduced. Although a lover of 



