California black oak
Native to the hills not far from campus, black oak is a deciduous tree with deeply lobed leaves (usually seven lobes) and a number of bristles on each lobe where the veins terminate. The leaf shape is similar to that of Quercus coccinea, but the color is a deeper green, glossy on top and lighter beneath. The acorn is about 1½ inches long, about half enclosed in the scaly cup. California black oak accounts for about one-fifth of all hardwoods in California.
To see fine examples, sign up for a tour of Jasper Ridge Biological Preserve. Six young trees are on Bonair Siding at the edge of the Maples Pavilion parking lot.
Illustrations: Jasper Ridge plant photo archive.
About this Entry: The main text of this entry is from the book Trees of Stanford and Environs, by Ronald Bracewell, published 2005.