 B. telmatiaea grows only in the Swan Coastal Plain , Geraldton Sandplains and Jarrah Forest biogeographic regions , inland from the coast but never east of the Darling Scarp . It occurs from Hill River near Badgingarra in the north , to Serpentine in the south . Most populations occur north of Moore River or south of Cannington , there being only a few scattered populations in between . 
