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Crataegus douglasii
http://www.fs.fed.us/database/feis/plants/shrub/cradou/
Includes distribution and occurrence, botanical and ecological characteristics, value and use, and fire ecology.
Crataegus douglasii (Black Hawthorn)
http://www.cwnp.org/photopgs/cdoc/crdouglasii.html
Photos and brief description.
Crataegus monogyna
http://www.dipbot.unict.it/orto/0298-1.html
images