The overcup oak, _Quercus lyrata_ Walt., is similar to the white oak, but may be distinguished by the nearly spherical cup which nearly covers the somewhat flattened acorn. This oak occurs in the river bottoms in southern Illinois. +BUR OAK+ _Quercus macrocarpa_ Michx. THE bur oak, which occurs throughout the State takes its name from the fringe around the cup of the acorn. It usually has a broad top of heavy spreading branches and a relatively short body. It is one of the largest trees in the State. In maturity, it attains a diameter of 5 feet or more and a height of over 80 feet. The _bark_ is light gray and is usually broken up into small narrow flakes. The bur oak does not often form a part of the forest stand, as do some other oaks, but occurs generally singly in open stands and in fields. It requires a moist but well-drained soil. [Illustration: BUR OAK One-third natural size.] The _leaves_ resemble somewhat those of the common white oak, but have a pair of deep indentations on their border near the base, and wavy notches on the broad middle and upper portions of the leaf. They range from 6 to 12 inches long and 3 to 6 inches wide. The _fruit_, or acorn, is a nut set deeply in a fringed cup. It is sometimes 1 inch or more in diameter but varies widely in respect to size and the degree to which the nut is enclosed in the mossy fringed cup. The _wood_ is heavy, hard, strong, tough and durable. It is used for much the same purposes as the other white oaks, lumber, piling, veneer logs, crossties and fuel. The swamp white oak, _Quercus bicolor_ Willd., occurs scattered in swamps, through the State. The leaves are obovate, coarsely toothed and wedge-shaped below. They are thick, dark green and shining above, pale and downy beneath. The acorns are borne in a deep rough scaly cup, on stems 2-4 inches long. The wood is like that of the white oak. The bark is gray-brown, separating into large, papery scales which curl back. +YELLOW CHESTNUT OAK+ _Quercus muhlenbergii_ Engelm. THIS oak, also called the chinquapin oak, which is an excellent timber tree, occurs throughout the State. It grows on practically all classes of soil and in all moisture conditions except in swamps, and is a very tenacious tree on shallow, dry soil. The _bark_ is light gray, and breaks up into short narrow flakes on the main trunk and old limbs. It reaches a height of 70 to 90 feet. The straight shapely trunk bears a round-topped head composed of small branches, which makes it an attractive shade tree. [Illustration: YELLOW CHESTNUT OAK One-third natural size.]