Req: Keys to tree families

[Poba1]

Hello all,

I am looking for twig and bud keys that identify North American trees, by
family and by genus.  I have a number of winter keys, but they tend to
address woody plants in general and therefore include a lot of species
that are "unnecessary" for my purposes. I would also like to hear about
keys that have been "computerized".

Please respond directly to me with your favorites; I will summarize and
post to the list(s). I have cross-posted to bionet.plants,
bionet.agroforestry, and sci.bio.ecology.

Thanks,

John

John D. Shaw
GIS Specialist
Engineering Systems Div. (Attn: AFZA-PW-Y)
XVIII Airborne Corps and Fort Bragg
Fort Bragg, NC 28307
(910)396-8108
DSN 236-8108

Poba1 at aol.com
shawj at bbs.bragg.army.mil