[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")
[GMBOT] Robinson, Benjamin, Fernald, Lyndon, 1908
Gray's New Manual of Botany (7th edition); A Handbook of the Flowering Plants and Ferns of the Central and Northeastern United States and adjacent Canada; American Book Company
Finland; For the time being these pictures are only for this site. Other usage not allowed.
[SK] Mela & Cajander, 1906
Suomen Kasvio; Viides painos
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.