The Manchineel Tree is native to Florida and can be found on sandy beaches and brackish marshes among mangroves. It has a fruit that resembles an apple. The tree can grow to around 50ft tall and is listed as endangered in Florida.
The Manchineel Tree is also very poisonous. According to Nicola H Strickland who ate a Manchineel apple without knowing the danger on the caribbean island of Tobago. She wrote about her experience.