Unfortunately I can't be much help in this instance. I note that this is recorded on a ridge. Poa lab tends to dominate in low drainage lines in grassland and open woodland. If this is Poa, it's more likely to be Poa sieberiana which occurs in woodland and dry forest. Both species are often used in gardens and native landscaping projects so you might be able to look at some gardens as examples to further reinforce your understanding of the species habit until you are more comfortable making an ID.
I went back to look at this, and the flowers don't look any different than in picture 3. They don't seem to open much more than a few millimetres (picture 4) and don't look at all like the pictures available of flax lily flowers... Maybe this is a stunted version of this plant due to poor soil? I opened up one of the flowers, and there was what seemed like a large green seed in it (see picture 5).