Plant Galls of the Western United States by Ronald A. Russo

Like a mole on your face, plant galls are (usually) harmless: extracting nutritious sap, creating safe havens for larvae, or serving as a defense against the environment and predators. Gall-inducing insects such as wasps, fruit flies, and aphids, in addition to fungi and bacteria, can chemically or mechanically rewire the gene expression of plant tissues, creating galls on every part of the plant from the roots to the branches to the buds. Each page contains macro photographs, which showcase the incredible diversity of gall shapes and sizes. You will also find ample descriptions of inducer-host interactions and tips for identification in the field. 

Paperback, 400 pages, Princeton University Press, 8 ¼” x 5 ¾”.