Sometimes typing the name in works, sometimes not. Use the botanical name, not a common name. You can do a 'first draft' of typing them and see which ones connect to the database, then edit those that don't. After adding names, any that don't show up above the pic as a link are those that have not connected to the database, and won't show up on the entry for that plant. Those are the ones you would have to look up and paste.
If they don't connect, I tag them by using 2 windows, looking up each plant in 1 window, tagging the pic in the other window. If all of the plants are on your list here, and especially if they have hybrid/cultivar names, finding them that way might be slightly quicker.