Macropsychanthus megacarpus

Macropsychanthus megacarpus (syn. Dioclea megacarpa) is a species of flowering plant in the family Fabaceae, native to Central America, Colombia, Peru, Bolivia, northern Brazil, Trinidad and Tobago, and the Windward Islands. A climber, it is typically found in wet tropical rainforests. Its seeds contain large amounts of the non-proteinogenic amino acid L-canavanine, which replaces the essential arginine producing abnormal proteins and enzymes and resulting in severe malnutrition to insect pests and other herbivores.