Standing like a great dark thunderhead against the pale California sky, the legendary "Mother Orange Tree" of Oroville fills the frame of this early black-and-white postcard — a horticultural celebrity in its day, this ancient Washington Navel orange tree was said to be the progenitor of California's entire navel orange industry, brought from Bahia, Brazil, in the 1870s and planted in Oroville, Butte County, where it grew to extraordinary size and became a local pilgrimage site. A low white fence and a stone or concrete marker are just visible at the base of the massive canopy, and neatly trimmed shrubs border the foreground. Published by the Pacific Novelty Co. of San Francisco — a prolific West Coast postcard publisher active from the early 1900s through the 1930s — this unused card carries no postmark or message, making it a clean example of California agricultural history ephemera. The card number 6812 and the plain "Post Card / For Correspondence / For Address" back layout suggest a 1910s–early 1920s printing.