Looks like a terrestrial orchid to me. An Epipactis, I would say.

If it is an Epipactis, you may wish to compare to Epipactis helleborine. It is a non-native plant that I'm seeing more and more of on my hikes here in Western NY State.

FataMorgana

Seed pods shown here are amazingly similar, leaf shape/width seems wider in most photos online, although photos seem to show narrower leaves near the top of the plant and wider at the base; leaves in my photo are not visible near the base. Seems like a very good candidate, and if so, this will be the first time I have ever seen any plant from the orchid family in my area.

http://www.andydownunder.com/nature_profiles?id=107

It was the width of the leaves which stopped me specifying which Epipactis. But Helleborine would fit fairly well. It's an invasive for you, a rarish native for us over here.