Acorns from different trees to show variation.]

White oak was formerly much used in construction work, but it has become

so costly that cheaper woods take its place. At present it is used

principally in cooperage, interior finish, wagon and car stock,

furniture, agricultural implements, crossties, and veneer. Indiana has

the reputation of furnishing the best grade of white oak in the world.

Little attention has been given this valuable species either in

horticultural or forestal planting. This no doubt is due in a great

measure to the slow growth of the tree. It should be used more for shade

tree, ornamental and roadside tree planting. There are good reasons why

white oak should be much used in reforestation. The cheapest and most

successful method of propagating white oak is to plant the seed in the

places where the trees are desired to grow. This is best done by

planting the acorns as soon as they fall or are mature. The best results

will be obtained if the nuts are planted with the small end down, and

covered about an inch deep with earth. If the ground is a hard clay soil

and the small end of the nut is placed down a half inch of earth on the

nut is sufficient. Rodents often destroy the nuts, and if this danger is

apprehended it is best to poison the rodents or to stratify the seed, or

grow seedlings and plant them when they are one year old. In forestal

planting it is suggested that the planting be 4 × 4 feet.

The white oak is quite variable in the lobing of the leaves, and in size

and shape of the fruit, and in the length of its peduncle. The variable

lobing of the leaves has lead several authors to describe varieties

based on this character. The latest is that of Sargent[32] who

describes: "The trees with leaves less deeply divided, with broad

rounded lobes and usually smaller generally sessile fruit," as =Quercus

alba= variety =latiloba=.

=Quercus alba × Muhlenbérgii= (× _Quercus Deami_ Trelease). This rare

hybrid was discovered in a woods about 3 miles northwest of Bluffton

Indiana by L. A. Williamson and his son E. B. Williamson in 1904.[33]

The tree is still standing and in 1918 bore a heavy crop of seed. A

liberal quantity was sent for propagation to the Arnold Arboretum, New

York Botanical Gardens, and Missouri Botanical Gardens. The Arboretum

succeeded in germinating several seed. The New York Gardens succeeded in

getting 5 seedlings. The Missouri Gardens failed to get any to

germinate. About a gallon of seeds was planted in the Clark County State

forest nursery and all failed.

=2.= =Quercus bícolor Willdenow.= Swamp White Oak. Plate 41. Large

trees; leaves on petioles 5-20 mm. long, 8-18 cm. long, obovate,

wedge-shaped or narrowly rounded at base, rounded or pointed at the

apex, margins coarsely divided with rounded or blunt teeth or somewhat

pinnatifid, primary venation beneath somewhat regular, but usually some

of the veins end in a sinus of the margin, both surfaces hairy at first,

becoming smooth above and remaining velvety pubescent beneath; the upper

surface of the leaf a bronze or dark green and the under surface grayish

due to the dense tomentum, which in some instances becomes sparse and

short, in which case the under surface is a light green; acorns usually

in pairs on stalks 2-7 cm. long; nuts ovoid, 2-2.5 cm. long, enclosed

for 1/3-1/2 their length in the cup; scales of cup acute to very long

acuminate, scurvy pubescent and frequently tuberculate; kernel sweetish.

=Distribution.=--Maine, southern Ontario, southern Minnesota south to

Georgia and Arkansas. Found in all parts of Indiana. It is always found

in wet places. In most of its range it is associated with the bur oak

from which it is not commonly separated. In the northern counties it is

usually associated with pin and bur oak, and white elm; in the flats of

the southeastern part of the State it is usually associated with cow oak

and sweet gum, while in the southwestern counties it is found most

commonly with Spanish and pin oak.

=Remarks.=--Commercially the wood is not distinguished from white oak,

and the cut is sold for that species.

=3.= =Quercus Muhlenbérgii= Engelmann. Chinquapin Oak. Sweet Oak. Yellow

Oak. Chestnut Oak. Plate 42. Large trees; leaves on petioles 1-3 cm.

long, blades very variable in size, shape and leaf margins, generally

10-20 cm. long, oblong-lanceolate to broadly obovate, narrowed or

rounded and more or less unequal at the base, taper-pointed at the apex,

the apex always forming an acute angle, margins coarsely and rather

regularly toothed, primary veins beneath regular and straight, and end

in a prominent gland in the point of the teeth, teeth more or less

incurved, leaves smooth and dark green above, and grayish pubescent

beneath; acorns generally sessile, but often on short stalks up to 1 cm.

long; nut ovoid to oblong ovoid, 10-18 mm. long, enclosed for 1/4-1/2

its length in a very thin cup; scales of cup ovate, blunt-pointed or

merely acute, sometimes tuberculate near the base of the cup, grayish

pubescent without; kernel sweet, and the most edible of all of our

oaks.

[Illustration: Plate 41.

Trees of Indiana First Revised Edition (Publication No. 13, Department of Conservation, State of Indiana) · 第 84 / 265 题