Caption Leaf arrangement with one leaf per node is called alternate phyllotaxis whereas arrangement with two or more leaves per node is called whorled phyllotaxis. Common alternate types are ...

Henslow's objections (NATURE, vol. vii., p. 403) to my condensation-theory of leaf-arrangement are due to a double oversight on his part. First, he has overlooked the condition of contact among ...

In this edition of ID That Tree, Purdue Extension forester Lenny Farlee gives tips on how to identify two species – honey locust and bur oak – from just the markings and scarring on leafless twigs.