A deck of electronic learning cards?
I'm afraid I don't get you. What would the "card reader" be? Would you care to detail?
In fact, it's not the geotagging that I like the most but the physical graffiti next to the plant.
I like the fact that the people don't have to
take a step to learn, you show them and (maybe) they'll remember it. The name is a first step. These plants are everywhere when one starts looking for them, yet very few people know their names any more.
I'm not sure their edibility is relevant in the case of these
pavement plants which breathe toxic fumes all day long and are pissed upon by dogs and drunks