Thanks for the help!AFAIK, the "toxin" are just oxalates, like in rhubarb, and that mostly in the bulbs. Some animals are more sensitive to that (dogs almost 8 times compared to rats), if fed too much they can get kidney problems (humans too). Rabbits are not easily poisoned, they evolved to survive quite a lot of what botany throws at them. If you don't feed it regularily in considerable amounts there shouldn't be a problem.
You'll always find someone writing that somewhat is deadly if you serch for it, combined with"toxic" and "rabbit". If you believe all that you'll get paranoid pretty fast.