Sorry not to have responded earlier - I have been away. I think what you
are looking for is a vegetative key. No key will cover all plants and
vegetative ones are scarce. If you are in UK, one is in an advanced state
of production. I have used part of the draft and it promises to be very
good. Email me in about November and I will give you details, if has
been published by then.

Peter

wrote in message
...
Are there any textbooks for use in identifying Herbaceous plants in
winter (at least those that have persistant stems trough the winter).

thanks