490 



do not know to what extent there are differences in the bark between the trees called 

 " Gum " and " Box " respectively. Dr. H. I. Jensen calls it the " Silver-leaved 

 Box " and mentions that it is calciphile. It occurs in heavy soil and its geological 

 formation is basalt limestone alluvial. It is associated with Gidgea (Acacia Cambagei 

 and Georgince presumably) on Barkly Tableland. " Twin-leaf or Hollow Box, 

 characteristic of Tablelands, mixed with limestone and basalt soils." Armstrong 

 River. Victoria River district (collected by R. J. Winters for G. F. Hill, No. 458). 



Western Australia. — Nine-Mile Ridge, near Wyndham (W. V. Fitzgerald). To 

 a height of 40 feet; stem diameter about 1 foot; bark persistent, grey, fibrous, thin; 

 wood reddish, tough; stamens white and valves of fruits much exserted. On 

 quartzite. Mr. Fitzgerald further says it extends from the sources of Sturt's Creek 

 to the Ord River. 



AFFINITIES. 



1. With E. Shirleyi Maiden. 



Dealt with at Part LVIII, p. 426. 



2. With E. melanophloia F.v.M. 



Dealt with at p. 499. " There is no doubt, as Mueller points out ('Eucalypto- 

 graphia '), that Leichhardt records the Silver-leaved Ironbark (E. melanophloia) on many 

 occasions instead of the Silver-leaved Box (E. pruinosa).'' 1 (R. H. Cambage in Joum, 

 Roy. Soc. N.S.W., xlix, 424, 1915.) 



