Stewart Robert Hinsley schreef
There's a key to plant families online, which might help. See

http://home.iae.nl/users/linea/start.html

(Perhaps this can go in MiniFAQ # 049, assuming I wasn't mistaken in not
seeing it in # 048.)

***
Thanks for the support.

As to this key, that is based on Thonner's key. The German original should
be around here somewhere, but I failed to buy the English translation. I am
not closely familiar with it as I found it to be quite intimidating, a
feeling shared by everybody who I asked about it. I would not be inclined to
advise its use to the layman.

Something similar, but better supported, is part of the Delta package:
http://delta-intkey.com/angio/www/ident.htm
which is in the FAQ (although at the old address. I see they they have
moved). However, even this is likely to be hard going for a casual user, who
just wants to flip through a few pages of pictures to find a match. Usually
the plant in question will be fairly common and easily found, provided that
there is an internet source for that particular locality. That is usually
not the case. A flora in bookform is much more likely to exist, even though
the quality of the pictures will vary from place to place.
PvR