NOTES ON ACACIA. 71 



NOTES ON ACACIA, No. II.— TROPICAL WESTERN 



AUSTRALIA. 



(Including Descriptions of New Species.) 1 

 By J. H. Maiden, i.s.o., f.r.s., f.l.s. 



[Bead before the Royal Society of N. S. Wales, June 6, 1917.1 



As this paper includes a contribution towards a botanical 

 bibliography of the Nor-West (North West), it is necessary 

 to point out that this short and euphonious title has a 

 technical meaning in Western Australia different to that 

 usually understood in other parts of Australia. 



a. The Nor-West of local land administration may be 

 defined as extending from a little south of North West Cape 

 (near Point Cloates) north easterly to, say, Wolla. It lies 

 wholly within the tropics, almost touching the tropic of 

 Capricorn. 



b. Jutson 2 defines a North West physiographic division 

 as extending along the coast from the mouth of the DeGrey 

 River (20° approx.) in the north, to the mouth of the Mur- 

 chison River (28° approx.) in the south. See Fig. 7, p. 32, 

 where it is called the North West Peneplain. See also 

 Fig. 10, p. 38. 



On the north-east it is divided from the Kimberley Divis- 

 ion by that portion of the Eastern Division known as the 

 Great Sandy Desert. It is a fairly natural division, and I 

 will refer to it on a future occasion when collectively 

 reviewing the botanical provinces of the continent. The 

 length of the present paper precludes this now. 



c. I suggest that for present botanical purposes it will 

 be desirable to add to the previous division (a), the Kim- 



1 3 by W. V. Fitzgerald; 3 by J. H. Maiden. 



2 Bulletin No. 61, Geological Survey of W.A. (1914), p. 37. 



