Quercus boyntonii is a rare North American species of oak in the beech family. At present, it is found only in Alabama, although historical records say that it formerly grew in Texas as well. It is commonly called the Boynton sand post oak or Boynton oak.

Quercus boyntonii is a rare and poorly known species. It is a shrub or small tree, sometimes reach a height of 6 meters (20 feet) but usually smaller. Leaves are dark green, hairless and shiny on the upper surface, covered with many gray hairs on the underside.

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