"P van Rijckevorsel" wrote
Are you sure you want to go there?
As I understand it the taxonomy of Betula is something else.
Just the difference between Betula pendula and Betula pubescens is enough
to fill up any amount of time (provided you can read Russian; if not, you
can add a few years to learn that)
PvR

Martin Rand schreef
Let's hear it for the Atkinson Discriminant Function! :-)

+ + +
I assume that is a way to learn Russian quickly?
PvR