If Neville Longbottom ever turned evil, and decided to use his botanical powers to advance his wicked agenda, this is the plant he would use. Dumbcane will take away your power of speech, and then it will kill you.
Be careful what you touch, and what you eat. Some vegetation can snuff out your life as surely as a venomous snake. There are hundreds, if not thousands, of poisonous plants in the world, and some of them are deadly.