The sight of a gnarled, twisted tree can be whimsical and curious. How and why did it get that way? Is it supposed to look like that? While these questions play out in your imagination, it might bring ...

A tree with a spiral trunk is growing in a city. - Wulingyun/Getty Images While it is one thing to see a bonsai or other trained tree growing in a spiral, it is far more surprising when you find a ...

AMONG the Research Items in NATURE of July 23, 1932, p. 136, reference is made to an interesting paper on twisted trees by Knorr (J. Heredity, 1932, 23, No. 2). From a systematic survey of twisting in ...