[Sex. Syst.—Monoecia, Polyandria.
Gen. Char—See ante, p. 318.
Sp. Char.—Leaves obovate, oblong; obliquely divided into obtuse lobes; segments, oblong entire; cup hemispherical, tuberculated; acorn ovoid, oblong; fruit in pairs.
This tree is less elevated than the Q. tinctoria. It forms, however, a larger and more regularly-expanded head, with numerous horizontal branches. The trunk and branches have a whitish hue, hence the name White Oak. The leaves are of a silvery appearance, with a hoary under surface. The young leaves are covered with a fine silky down.
The bark is rough externally, of a light colour; the effete epidermis being arranged in flat layers On drying, the internal layer becomes brown. It breaks with a stringy fracture. The odour is decided and tan-like; taste astringent and bitter. This bark is used in tanning. For medicinal purposes it is preferred to the black oak.
DECOCTUM QUERCUS ALBAE, U. S.; Decoction of White Oak Bark.—(Take of White Oak Bark, bruised, an ounce: Water a pint and a half. Boil down to a pint and strain.)—Used as the Decoctum Quercus, p. 320.]