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Alder buckthorn is a small tree or tall shrub, common in the understory.

The fruits are very toxic.  Swallowing 6-7 of them can be lethal.  In case there is any suspicion of poisoning manifested by vomiting, strong abdominal pains and bloody stools, the sufferer should quickly be taken to hospital.  If charcoal tablets are at hand they may be given.