Castor Bean Poisonous part: The entire plant but the seeds, especially are very toxic. Clinical signs: The poisonous principle in ‘Ricinus communis’ is ‘ricin’, a highly toxic protein that can produce severe abdominal pain, drooling, vomiting, diarrhea, excessive thirst, weakness and loss of appetite. Severe cases of poisoning can result in dehydration, muscle twitching, tremors, […]