Having used such books, I don't think it is that simple. I mean you could make an app just like the books but it might not add any functionality and as such not

Having used such books, I don't think it is that simple. I mean you could make an app just like the books but it might not add any functionality and as such not be usable for the wide public. Thing is, the series your questions you show are easy to answer but they don't get you any further than halfway. Problem is in the questions you do not show: there it starts going into details, terminolgy starts to matter (seriously, if you've never read those words it's like a foreign language) and differences become hard to spot. Part of this could perhaps be alleviated with pictures but I doubt it; I've seen websites attempt it but none were really good and they all did a subset of plants. Probably because it's quite the amount of work to do them all, even for a region.