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You can find interesting details about native conifers on this blog: 
Northwest Conifer Connections

The books and Web sites listed below were used as sources for the information in this guide. You can find more detailed information about native conifers there. 

Books

The Audubon Society Field Guide to North American Trees: Western Region by Elbert L. Little, 1980, Alfred A. Knopf, New York.

Conifer Country by Michael Edward Kauffmann, 2012, Backcountry Press, Kneeland, California.

Conifers of California by Ronald M. Lanner, 1999, Cachma Press, Los Olivos.

Conifers of the Pacific Slope by Michael Edward Kauffmann, 2013, Backcountry Press, Kneeland, California.

Conifers of the World by James Eckenwalder, 2009, Timber Press, Portland, Oregon.

Flora of Oregon Volume 1: Pteridophytes, Gymnosperms, and Monocots, 2015, Oregon State University.
-  An illustrated, comprehensive guide to the plants of Oregon available at oregonflora.org.

A Handbook of the World's Conifers by Aljos Farjon, 2010, Brill, Leiden-Boston.

A Natural History of Conifers by Aljos Farjon, 2008, Timber Press, Portland, Oregon.

Northwest Trees by Stephen F. Arno and Ramona P. Hemmerly, 2007, The Mountaineers Books, Seattle.

Trees in Canada by John Laird Farrar, 1995, Fitzhenry & Whiteside Limited, Markham, Ontario. The newest edition, Trees the of Northern United States and Canada, is essentially the same.

Trees to Know in Oregon by Edward C. Jensen, 2010, Oregon State University Extension Service.

Western Forests by Stephen Whitney, 1985, Alfred A. Knopf, New York.

The World of Northern Evergreens by E. C. Pielou, 1988, Cornell University Press, Ithaca and London.



On the Web

Common trees of the Pacific Northwest - Based on Trees to Know in Oregon.

Conifers of Western North America - Detailed information on conifers from the Gymnosperm Database at conifers.org

The Oregon Flora Project - The authoritative and comprehensive source of information on the plants of Oregon.

Silvics of North America - US Forest Service. Volume I covers information on habitat, life history and genetics of conifers. 

Trees of Washington - PDF that includes conifers of Washington and Oregon.

Conifer Country - Companion to Conifer Country by Michael Edward Kauffmann.


Maps

USGS Range Maps - Tree distribution maps from the US Geological Survey, based on U.S. Forest Service data. This is the source of the distribution maps in this guide.

Oregon Flora Project Atlas - Shows the location of tree sightings in Oregon.

Hoyt Arboretum Plant Database - Shows the location of trees at Hoyt Arboretum, Portland. 

Oregon Forest Types - Oregon Wild's map of forest types (PDF).








































© 2012 Ken Denniston