Cerbera manghas (Apocynaceae) – pink-eyed cerbera, sea mango seed
Seed from the Kew Millennium Seed Bank collection at Wakehurst, outside London in the UK.
Cerbera manghas (Apocynaceae) – pink-eyed cerbera, sea mango; native from the Seychelles to the Pacific – drift fruit; commonly found as flotsam on beaches in the Indian and Pacific Ocean. After the outer skin of the fruit has rotten away, the cage of woody vascular bundles enclosing a massive corky mesocarp with large intercellular air-spaces that affords the fruit excellent and long-lasting buoyancy in sea water; length of fruit: 9cm.
Wikipedia: The leaves and the fruits contain the potent cardiac glycoside cerberin, which is extremely poisonous if ingested. People in olden times used the sap of the tree as a poison for animal hunting. The fruit was reportedly eaten to commit suicide in the Marquesas Islands. Because of its deadly poisonous seeds, the genus name is coming from Cerberus, the hell dog from the Greek mythology, hence indicating the toxicity of the seeds. In Madagascar, the seeds were used in sentence rituals to poison kings and queens