Some of the potato orchids have started to bloom. Hopefully there's enough detail to confirm it now rather than just Gastrodia sp. If there isn't, please let me know what to look for as there's no leaves etc and I will take some more photos later on.
The local species is G. sesamoides. However, given the location of the species, the likelihood is that it was introduced in the mulch, so could be the similar looking species, G. procera, which tends to be a taller more robust plant. The main way of telling them apart is from the unopened buds; the immature inflorescence being recurved like a shepherd's crook. Did you notice the appearance of any plants where the flowers had not yet opened?
One this one and another have started to flower. The rest haven't opened yet and look like http://canberra.naturemapr.org/Community/Sightings/Details/3384498 They sort of stick out rather than a shepherd's crook.