Here’s a tip I found at Reader’s Digest (and don’t laugh; I LOVE Reader’s Digest): You can turn your iPhone into an “image encyclopedia.”
For instance, if you take a photograph of a tree with interesting leaves, you can go to images.google.com, tap the “Aa” icon in the search bar, and select “Request Desktop Website.”
Now you can upload phots form your smartphone’s camera roll that you snapped. Do a reverse Google Image search on your iPhone as you would on, say, a Mac.
Or just use the Google app. It defaults to text or image.