So said the eminent Harvard botanist Asa Gray, on page 451 in his encyclopedic “Lessons in Botany and Vegetable Physiology,” a book published in 1872. I got my copy at an old bookstore several years ...

Rotational-fit methods were used to examine shape variation in oak leaf morphology by reference to a set of 14 landmarks for each leaf. Within-tree, between-tree, and between-species variations were ...

The lymphatic system is a network of branching vessels that regulate fluid balance and support the immune system. Its smallest capillaries, comprised of a single endothelial cell layer, must stay ...

The chinkapin oak (Quercus muehlenbergii) is a tree native to Ohio that likes to spread out. The leaves are a bit different from the usual oak leaf shape; the chinkapin oak's foliage does not have the ...

Many coast live oak (Quercus agrifolia) trees are showing unusual browning in their canopies in the last month or two. If you look carefully, you may see small, crescent-shaped galls forming on the ...

A new study published in Forest Ecosystems has found that two evergreen oak species in the Himalayan-Hengduan Mountains region adapt to their environments in very different ways by changing how their ...

The cells that make up the walls of the finest of all lymphatic vessels have a lobate, oak leaf-like shape that makes them particularly resilient to changes in fluid volume. A similar cell shape also ...