In message
,
AndyS writes
In case anyone's curious, I was able to get an ID on this plant:
Pilea pumila, or Canadian clearweed.

I assumed that it wasn't Urtica dioica, as you would presumably have
noticed the stings, and therefore some North American relative, but I
see that Wikipedia says that Pilea pumila is often mistaken for nettle.

-AndyS

--
Stewart Robert Hinsley