Bryony is another of the highly poisonous plants of Wilden Marsh. I found this specimen in the Swamp this morning, but it’s common and I find it growing on the hills as well as in the valley. All parts of bryony contain bryonin which is poisonous and may cause illness or death. Livestock may also be poisoned by consuming the fruit and leaves. Forty berries constitutes a lethal dose for adult humans.