A while ago I was trying to look up what plants were native to my area; I tried searching several different ways, even in my own language, but somehow every result ended up being about the USA or a specific state in the USA. Eventually I found one, but it took a while.
So if you're reading this, and you're a botanist (or just someone who knows a lot about plants), and not an American, I'd encourage you to maybe create some kind of site that lets the people in your area know which plants there are native. It could be extremely useful for someone one day!