I want do the same for mushroom, because they are hard to recognize. Google images works quite fine.
https://play.google.com/store/apps/details?id=com.pingou.cha...
https://itunes.apple.com/us/app/champignouf/id1227854971
ps: any improvement suggestion is welcome!
Google Image is really working quite good. I made a lot of test. The only problem is about there's TOS. I can easily write something but I don't want to be flagged because I don't want use there API.