Yes, there are several that potentially could kill you. Most that are toxic likely wouldn't though, just make you very ill. Mushrooms are more reliable for that method. The biggest problems are that different specimens of the same species could contain different amounts of toxins, which makes the correct dosage hard, and a failure could very well permanently damage both your organs and nervous system. That and that it absolutely would suck, you'd likely be in extreme agony before you die.