Fed up with Googling, so perhaps somebody here knows the answer: I'd
be most grateful for any help.

I'm looking for online world plant distribution maps, in particular
at present for stinging nettle species. I've found plenty for
particular countries, but not one for the world.

My curiosity is because a R4 programme about British exports of
stinging-nettle tea to China (they're welcome to it) mentioned that
our nettle was unknown in that country. I assume they meant either or
both of _Urtica dioecia_ and _U. urens_. Either way, I was a bit
surprised -- I gather the things are found at least as far east as
India, and they are introductions in N. America and Australia.

I never cease to be surprised at how slow plants seem to be to spread
across land-masses, even allowing for deserts and mountain ranges.

--
Mike.