What is the most rare flower that can help create new and helpful drugs

Question: What is the most rare flower that can help create new and helpful drugs
- Keywords:
  drug,
  flower
Asked by The wonder guy(DLang?) to Jaine on 17 Nov 2016.
- Jaine Blayney answered on 17 Nov 2016:
  
  Aspirin comes from the willow tree. The opium poppy gives up modern day opiates eg codeine. There are more here: http://theweek.com/articles/464010/8-drugs-that-exist-nature

Question: What is the most rare flower that can help create new and helpful drugs