Plant Highlights

Quercus x macdonaldii, formerly Quercus macdonaldii, with the common names MacDonald's oak and Macdonald oak, is a rare species of oak in the Fagaceae family. The tree is endemic to the California Channel Islands, on Santa Cruz Island, Santa Rosa Island, and Santa Catalina Island, in Southern California. It is found in chaparral and woodlands habitats in canyons and slopes below 600 meters (2,000 ft). Quercus x macdonaldii is a Vulnerable species, threatened by habitat loss. Taxonomy. The plant was reclassified as Quercus x macdonaldii, a naturally occurring hybrid of Quercus berberidifolia and Quercus lobata.
Reference: Calscape