Field notes give height as 25-35 cm.
Three tussocks growing on area disturbed by road machinery (scraped to drain water off main trail) .
Culms flattened. Old and younger inflorescences present.
PlantNet says L. concavum is restricted to the coastal Sydney region., which might rule it out for this site ?
PlantNet also says that the rest of what was considered L. concavum is now L. sieberi, but unfortunately the description of L. sieberi in PlantNet is yet to be finalised.