My HS Bio teacher had a plant in her classroom. Said that it was African, and that it was used for poison darts. A buddy of mine in an experiment took 1 drop, diluted that in a liter of water 1:20,000). Took 1 drop, diluted in a liter of water (1: 40,0000,000). Took 1 drop of that and put it in a liter with a Goldfish. Goldfish paralyzed in seconds.