 It is most common amongst the kwongan heath of the Geraldton Sandplains north of Jurien ; it has a fairly continuous distribution there , often as the dominant species , and extends inland to around the 350 mm isohyet . On the Swan Coastal Plain to the south , its distribution is discontinuous , being largely confined to patches of suitable sand in the narrow transition zone where tuart forest gives way to jarrah forest . With the exception of a population at Point Walter ( 32 ° 00 ′ S ) , it does not occur on the sandplain south of the Swan River . 
