prominent hairs on the callus (top-right); a prominent row of long hairs around the 'waist'; and critically, in the middle, a tuft of shorter hairs. (There must be a matching tuft hidden behind it.). Nearly all wallaby-grasses outside the alps and subalps have a continuous row of hairs in the middle, except R. laeve, the Smooth Wallaby-grass.
Also, the overall shape of the seed (floret) and smoothness of the lemma body are distinctive to the trained eye. Damp grassy places are the favoured habitat of R. laeve, consistent with your specimen.
You might have noticed when you took your photos that the glumes are broader toward the base than normal for a wallaby-grass and they look whiter than usual when mature. The species' inflorescence size is unremarkable for a wallaby-grass. It's lowest branch or two are more inclined to deflex at anthesis than most species other than R. duttonianum, which also favours damp ground but on heavier soils.
It's a quite common species in higher-rainfall parts of southeastern Australia.
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