- Thuja (Cupressaceae); [GNSP]
- [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
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.