I find it difficult to be convinced about a bristle. In 2010 when I identified the plants as E. procera I had access to the PlantNet key and descriptions including diagrams which show little difference in the spikelet apex shapes for the 2 species. There are excellent photos of E. pseudoacrotricha in VicFlora https://vicflora.rbg.vic.gov.au/flora/taxon/32c2e118-3dfd-49cf-a7c2-a15853f059a7#&gid=1&pid=3 but I have yet to find similar pictures for E. procera.
The diagrams in PlantNET for the 2 species are pretty hopeless and the species descriptions don't agree with the key. Because so many of the keys, descriptions and diagrams are shared between authors, these errors are propagated across many books and web pages. And this has led to widespread misidentification of the 2 species. In a discussion I had with Bryan Simon many years ago, he said the 2 key differences are the presence of a bristle in pseudoacrotricha and the spikelet size (4.5-6 mm long including bristle). Bristles are absent in procera and spikelets are 3–3.75 mm long. The best diagrams differentiating the two I've come across, are by Van Klaphake in Key to the Grasses of Sydney (he spent a lot of time in the Sydney herbarium checking all specimens for his book) On another note, E. procera is only recorded on the coast in the southern half of NSW.
Since I found this grass adjacent to the silo where we had been receiving grain for drought feeding from all over the place, I don't think the geographic distribution of E. procera is relevant.
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