If there was one plant you could find to cure something, what would it be? How would it work?

Question: If there was one plant you could find to cure something, what would it be? How would it work?
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Asked by littleg to Chia-Yu on 19 Jun 2013.
- Chia-Yu Lin answered on 19 Jun 2013:
  
  Actually, there are plenty of plants can be used for curing some diseases. You can know it from an book entitled Flora sinensis. For example. Portulaca oleracea can be used for detoxification as it contains lots of nutrients.

Question: If there was one plant you could find to cure something, what would it be? How would it work?