Saturday, February 02, 2008


Tree Geometry: Parallel Lines

Among the illustrations between pp. 112 and 113 of Bernd Heinrich, The Trees In My Forest (New York: Cliff Street Books, 1997), a twig of the yellow birch exhibits parallelism of the type I discussed a few days ago:

In Heinrich's drawing of the hop hornbeam twig, counting from the bottom the second and fourth segments are nicely parallel, the first and third less so:

The trees in which these parallel twig segments have been noticed (European hornbeam, American hornbeam, yellow birch, hop hornbeam) are all members of the family Betulaceae.

From western Maine, Beth writes appreciatively and perceptively about another book by Bernd Heinrich, A Year in the Maine Woods.

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