[DVF] Den Virtuella floran http://linnaeus.nrm.se/flora/welcome.html; Ett projekt vid Naturhistoriska riksmuseet (Stockholm, Sweden).; Even for non-Swedish speaker, the distribution maps on species are nice (map buttons "Norden" and "Norra halvklotet")
Finland; For the time being these pictures are only for this site. Other usage not allowed.
[TFG] Edgar T. Therry, ?1995
The Fern Guide: Northeasten and Midland United States and Adjacent Canada; [Original publication 1961]
[TSF] Eduard Thommen, 1951
Taschenatlas der Schweizer Flora
If you have corrections, comments or
information to add into these pages, just send mail to
Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.