Water Oak

Media
Illustration of water oak leaf.
Status
Name
Species of Conservation Concern
Scientific Name
Quercus nigra
Family
Fagaceae (oaks)
Description

Water oak is a medium to large tree with a tall straight trunk, a rounded, symmetrical crown, and ascending branches.

Leaves are alternate, simple, 2–4 inches long, broadest near the tip, fan-shaped, tapering to a long, narrow base; margin varies, sometimes entire with a rounded tip, often slightly wavy, usually with 3 broad lobes at the tip. Lobes sometimes with bristle tips. Leaf stalk less than ¼ inch long. Leaves turn yellow in fall; brown leaves persist into winter.

Bark is grayish-black, smooth, and tight on young trees, becoming shallowly grooved with wide, flat, scaly ridges with age.

Twigs are slender, reddish-gray, smooth.

Flowers April–May, in catkins.

Fruits September–October, acorns solitary or paired; brown, broadest at base and broadly rounded at the tip, about ½ inch long, cup covering to ½ of the nut, cup shallow, saucer-shaped, thin, reddish-brown; scales small, thin, flattened hairy; seeds bitter; ripening in autumn of the second year.

Size
Height: to 80 feet.
Where To Find
image of Water Oak distribution map
Its range is restricted to the southeast Missouri counties of Ripley, Butler, Dunklin, and Pemiscot. You can visit this and other rare lowland species at Allred Lake Natural Area.
Occurs in wet bottomland forests and edges of swamps (not within permanent swamplands) in the southeastern Missouri lowlands. Also used as an ornamental in lawns of southeast Missouri. This species, like many plants and animals that require wet lowland forests, has been declining in our state due to extensive clearing, rowcropping, ditching, and draining in our Bootheel counties.
Water oak is a Species of Conservation of Concern in Missouri. The natural range of this water oak is from east Texas to Florida to New Jersey, and north to Oklahoma and Tennessee. The Bootheel of Missouri represents a northern extent of its range. Unfortunately, much of our Bootheel lowland forest has been converted to agriculture or otherwise disrupted, so this tree's presence in our state is imperiled.
The lumber of this species is not rated as high as other oaks due to its abundance of knots; it has been used mainly for fuel. Except for hikers in our southeastern counties, and people from the southeastern United States where it is more common, most people know this species as a shade tree.
The acorns are eaten by songbirds, woodpeckers, ducks (especially mallards and wood ducks), wild turkey, mice, squirrels, raccoon, and white-tailed deer. A habitat is made of the total of environmental elements, including the trees. This interesting tree helps define our southeastern lowlands.
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Where to See Species

This property was donated to the Department by the Farmers Home Administration (FmHA) in 1992. Until acquired by FmHA in 1988, most of the area was farmed in milo, wheat, and soybeans.
About Trees, Shrubs and Woody Vines in Missouri
There are no sharp dividing lines between trees, shrubs, and woody vines, or even between woody and nonwoody plants. “Wood” is a type of tissue made of cellulose and lignin that many plants develop as they mature — whether they are “woody” or not. Trees are woody plants over 13 feet tall with a single trunk. Shrubs are less than 13 feet tall, with multiple stems. Vines require support or else sprawl over the ground.