Quercus kelloggii, commonly known as the California black oak, is a deciduous tree native to the western United States. It typically grows in mixed forests and can reach heights of 50 to 80 feet. The tree is characterized by its lobed leaves, which turn vibrant shades of yellow and orange in the fall, and its acorns, which are an important food source for wildlife. This species thrives in well-drained soils and is often found in mountainous regions, particularly in California and Oregon. The California black oak plays a significant role in its ecosystem, providing habitat and food for various animals, including birds and mammals.