Arboreta
Woody plants are trees and shrubs, and botanical gardens that emphasize woody plants are often called arboreta (sing. arboretum). To tour several visit "The Huntington Library, Art Collections, and Botanical Gardens" homepage. Once there, scroll down and click on "Botanical Gardens" and wander around. Near the bottom is a heading "Other garden resources on the internet" that has links to the pages of other gardens and arboreta.
Visit the The Huntington Library, Art Collections, and Botan web site
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Dendochronology
The thickness of annual rings depends on growing conditions during the years they are formed. In good years trees produce thick rings, and in poor years they produce thin ones. The study of tree rings is called dendrochronology. Visit the "Laboratory for Wood Anatomy and Dendrochronoly" to see how the study of tree rings are carried out, and the types of information that can be obtained.
Visit the Lund University Sweden web site
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