They are very similar to Diuris subalpina (as per126 Field Guide to Orchids of the ACT) but these only grow at higher elevations. They look quite different to the photo of Diuris behrii on p110 of this same book.
I agree about the picture in the book, but the drawings are are more like your photo, as are the other D. behrii sightings on CNM. It's always helpful to have a picture of the leaves - D. behrii has a tuft of leaves like D. chryseopsis, but subalpina has only two.
The picture in the book actually looks quite unusual, if you look at other photos of D subalpina on CNM and the internet they don't look the same as that photo. The angle to the D behrii photo on the ACT book also makes it look a little different. I've never actually seen D subalpina so can't comment on what it looks like in the flesh, but fairly confident this isn't it.
I have recorded large, yellow, late flowering Diuris sp. at Bungendore as D. behrii, which i believe this to be. D. amabilis is a name applied to what have been considered to be D. behrii.
There appears to be only one reference that recognises D.amabilis. See: https://en.wikipedia.org/wiki/Diuris_amabilis
For the sake of Convesation, here is Copeland & Backhouse (2022). The extract refers specifically to Diuris amabilis.
"Only named and described in 2019. Formerly well known as D.behrii, but that species is now considered seperate and endemic to SA and western VIC, nescessitating a new name for plant in NSW and ACT. "
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