North-Western region, Nullarbor region around Maralinga and Barton then eastwards into the Gairdner-Torrens region near Mount Finke. In open scrub to tall shrubland associated with <I>Eucalyptus socialis</I>, and <I>Acacia ramulosa</I>. Soils; brown calcareous earths or red siliceous sands. Rainfall 150-200 ram. Also W.Aust. and N.T.