Thuja occidenalis L.
from (S.Labrador, Nova Scotia - Manitoba) - to (Massachusetts, New York, Ohio, N.Indiana, Illinois, Indiana, Minnesota), Appalachians (North Carolina, Tennessee). See [maps]Northern White CedarEastern ArborvitaeSwamp Cedar
[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")
[GNSP] Wielgorskaya, 1995
Dictionary of generic names of seed plants
[IBT] Grimm, 1983
The Illustrated Book of Trees
[maps] Warning! The maps are automatically generated from the textual information, and the process does not always produce acceptable result; See about maps for more info.
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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.