The Manchineel tree

Sounds like something in the Hunger Games arena.

 ... if you stay under its foliage while it's raining, the water will cause instant blistering wherever it touches you. ... You can't burn the Manchineel's wood because the smoke will cause temporary and even permanent blindness ... Ingestion [of the fruit] may produce severe gastroenteritis with bleeding, shock, bacterial superinfection, and the potential for airway compromise due to edema.