How many undescovered plantes do you think their are?

Question: How many undescovered plantes do you think their are?
- Keywords:
  discovery,
  galaxy,
  planet,
  universe
Asked by Goodwin to Julian on 12 Nov 2014.
- Julian Onions answered on 12 Nov 2014:
  
  Around our solar system – none – I think we’ve got them all.
  
  Around other stars, many many to find, probably several for each star there is out there.

Question: How many undescovered plantes do you think their are?