I don't really know for sure how to map these old ( [SK], [GMBOT])references to A. spicata, A. canadensis and A. rotundifolia into currentstate. I'm not a botanist. -- msa
[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")
[FPN] Hitchcock & Cronquist, 1998
Flora of the Pacific Northwest (11th ed.); ISBN 0-295-95273-3
[GFP1] Hutchinson, 1964
The Genera of Flowering Plants; Dicotyledons; Volume 1
[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
[IBT] Grimm, 1983
The Illustrated Book of Trees
[RK] Hämet-Ahti, L., Suominen, J., Ulvinen, T. & Uotila, P. (eds), 1998
Retkeilykasvio (Field Flora of Finland); Ed. 4. 656 pp.; Finnish Museum of Natural History, Botanical Museum. Helsinki
[SK] Mela & Cajander, 1906
Suomen Kasvio; Viides painos
[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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Markku Savela
Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.