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American Hazel: Corylus americana - http://www.cnr.vt.edu/DENDRO/DENDROLOGY/SYLLABUS/factsheet.cfm?ID=208
Description and range, with photographs of twig, bark, leaves, catkins, nuts and form. |
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Corylus cornuta - http://www.fs.fed.us/database/feis/plants/shrub/corcor/all.html
Distribution, occurrence, botanical and ecological characteristics, value, use and fire ecology of the California hazlenut. |
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Hazel: Corylus avellana - http://www.plant-identification.co.uk/skye/corylaceae/corylus-avellana.htm
Photographs of this tree, its leaves, nuts and catkins. |
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Corylus avellana - http://www.dipbot.unict.it/orto/0487-1.html
Images of foliage and catkins. |
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Corylus americana (American Hazel) - http://www.cnr.vt.edu/dendro/dendrology/syllabus/camericana2.htm
Describes physical characteristics and provides photos leaf, fruit, flower, bark, and twig. |