One of the mysteries of the English language finally explained.
An evergreen oak, Quercus sadleriana (family Fagaceae), of western North America, having large serrated leaves and a shrubby growth habit.
Late 19th century. In some forms from the name of John Sadler, British botanist + oak, after scientific Latin Quercus sadleriana, named in honour of John Sadler. In some forms from the genitive of the name of John Sadler + oak.
Sadler's oak/ˌsadləz ˈəʊk/
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