This specimen is too immature to be attributed to species level. The cross-section leaf profile shape expected of a species will not yet have been produce on a plant of this size and age, therefore it will be almost impossible to determine the species for a plant of this age, even for an expert in Xanthorrhoea, unless there were identifiable adult plants nearby.
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.
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