"Mike Lyle" wrote in message
...
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.

....

According to wikipaedia, China specifically is host to at least 2
nettle species, Urtica platyphylla and Urtica angustifolia and may
be host to others on the list. Quite how many competing species of
any one particular genus can establish themselves and surive alongside
already established species will presumably be a primary limiting
factor, regardless of the distribution vectors.

The full list is as follows -

Urtica angustifolia. China, Japan, Korea.
Urtica cannabina. Western Asia from Siberia to Iran.
Urtica dioica (Stinging nettle or Bull nettle). Europe, Asia,
North America.
Urtica dubia (Large-leaved nettle) Canada.
Urtica ferox (Ongaonga or tree nettle). New Zealand.
Urtica hyperborea. Himalaya from Pakistan to Bhutan, Mongolia and
Tibet, high altitudes.
Urtica incisa (Scrub nettle). Australia.
Urtica laetivirens. Japan, Manchuria.
Urtica parviflora. Himalaya (lower altitudes).
Urtica pilulifera (Roman nettle). Europe
Urtica platyphylla. China, Japan.
Urtica thunbergiana. Japan.
Urtica urens (Dwarf nettle or Annual nettle).
Europe, North America.

http://en.wikipedia.org/wiki/Nettle


michael adams

....





--
Mike.