- Assignment: Twigs (Kellogg Community College): <http://academic.kellogg.edu/herbrandsonc/bio111/assignments/twigs.htm>
- Budding in Plants (Wild Pacific Northwest): <http://www.wildpnw.com/2010/12/27/budding-in-plants/>
- Burke Museum Winter Twig Identification Key: The Burke Museum of Natural History and Culture website contains many resources and tools associated with the University of Washington Herbarium. You may get assistance in identifying many comment shrubs and trees during the winter by selecting either of the two “Winter Tree & Shrub Key” links on the WTU Herbarium Image to go to the Winter Twig Identification Key.
- Photos of Real Twigs and Buds – A nice set of photographs of winter twigs and buds is available here for downloading: <http://www.naturedetectives.org.uk/download/id_twigs.htm>.
- Twig Tracking (North Cascades Institute): <http://chattermarks.ncascades.org/naturalist-notes/trying-out-twig-tracking/>
- Using a Tree Twig for Winter Tree Identification: <http://forestry.about.com/od/treeidentification/a/wti_twig.htm>
- VTree ID Twig Key (Virginia Tech) – The Virginia Tech Department of Forest Resources & Environmental Conservation has a twig identification key that covers all 50 states at <http://www.fw.vt.edu/dendro/dendrology/syllabus/twigkey/key1.cfm> (an older version) and <http://www.dendro.cnre.vt.edu/dendrology/syllabus/twigkey/location.htm> (an updated version). It includes audio links to Italian Latin pronunciations of botanical Latin nomenclature, e.g., the pronunciation of “Betulaceae Alnus rubra” sounds like this.
- Winter Dichotomous Key (UNBC & Aleza Lake Research Forest Plant Systems Database): <http://web.unbc.ca/~fsty201/WDK.html>
- Winter Twig Identification Class (PowerPoint PDF) – Download the PDF version here. This file is also available at <www.arthurhaines.com/winter%20twigs.pdf>.
- Winter Twigs: A Visual Key to Deciduous Trees Native to Illinois: <Winter Twigs: A Visual Key to Deciduous Trees Native to Illinois>
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