Wow - what a lovely plant, poisonous or not!
I can't really help although my first thought was something related to spurge due to the leaves, but, then, one of the helleborines (types of orchid) seems to me to be possible.
[Edit] But, do any helleborines have opposing leaves ? If not, then more likely a spurge related plant. If so, sap likely to be a skin irritant: I wouldn't know whether any animals can tolerate any type of spurge if eaten, but probably not I would guess.
[If you allow it to go to seed [member=28376]wayfarer[/member] I would be very interested in acquiring some seed.]