Abrus precatorius. The seed is official in Spain, and the leaves in the Netherlands.

An infusion (3 to 5%) instilled into the eye sets up a violent corneal inflammation; it is sometimes cautiously used by ophthalmologists in the treatment of pannus. For the technic see the special works on ophthalmology. It has also been used in obstinate cases of trachoma. Three parts of the seed are macerated for 24 hours in 500 parts of cold distilled water; then add 500 parts boiling water. Filter when cold. Don't use this unless you are a skilled ophthalmologist, and then follow the technic of Ramsey, Swanzy, or Ball.