Leaves slightly channelled above; triangular in XS. Many had flower spikes; several of these were black, possibly suffering from the excessively cold day of about 10-14 days earlier.
This specimen may indeed be X. concava, however Xanthorrhoea resinosa cannot be rules out. This is an affiliated species to X. concava. The leaves do appear narrow for X. concava and the crown has a tidy symmetrical habit, X. concava typically can appear to have a more untidy appearance.