Trees of the Eastern and Central United States and Canada: The identification, habits, distribution, woodlore and uses of conifers and hardwoods, both native and escapes, illustrated with over 600 photographs
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This is an extensively revised edition of the standard semipopular Trees of the Eastern and Central United States and Canada. It covers all the important native trees found in this area. A concise introduction provides all that you need to know for general identification of trees. Then, an eight-page, easy-to-use synoptic key enables you to locate at a glance the group or genus of any tree you are likely to encounter. Supplementary keys in the main text help you easily locate the various species.
More than 140 different trees are described in detail, with information on general appearance, habit of growth, leaf forms, flowers, fruit, twig appearance, bark, and other features. Additional information includes habitat, distribution by states, commercial use, and even woodlore.
Treatment throughout this fascinating book is semipopular; it is neither a slight sketch, nor a monograph for the specialist. It is a middle-range book, carefully written for the intelligent reader who is sincerely interested in accurate information about trees. With it you will be able to identify at sight almost any tree, not only by group but also by species. You will be able to tell a sugar maple from a Norway maple, a black oak from a white oak, a horse-chestnut from a chestnut. You will know which trees have edible fruit, which are suitable for house plantings, what climate and drainage conditions trees need, and a multitude of facts about each of more than 250 trees.
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Trees of the Eastern and Central United States and Canada - William M. Harlow
DOVER BOOKS ON PLANTS AND ANIMALS
BATS: BIOLOGY, BEHAVIOR AND FOLKLORE, Glover Morrill Allen. (0-486-43383-8)
PLANTS, MAN AND LIFE, Edgar Anderson. (0-486-44193-8)
THE HOLY EARTH: TOWARD A NEW ENVIRONMENTAL ETHIC, Liberty Hyde Bailey. With a New Introduction by Norman Wirzba. (0-486117041-5)
101 QUESTIONS ABOUT THE SEASHORE, Sy Barlowe. (0-486-29914-7)
GALAPAGOS: WORLD’S END, William Beebe. (0-486-25642-1)
COMMON BIRD SONGS CD, Donald J. Borror. (0-486-99609-3)
COMMON BIRD SONGS, Donald J. Borror. (0-486-99911-4)
HERBS AND HERB LORE OF COLONIAL AMERICA, Colonial Dames of America. (0-486-28529-4)
MEDICINAL AND OTHER USES OF NORTH AMERICAN PLANTS: A HISTORICAL SURVEY WITH SPECIAL REFERENCE TO THE EASTERN INDIAN TRIBES, Charlotte Erichsen-Brown. (0-486-25951-X)
FABRE’S BOOK OF INSECTS, Jean Henri Fabre. (0-486-40152-9)
THE ROCK BOOK, Carroll Lane Fenton and Mildred Adams Fenton. (0-486-42267-4)
FINDING YOUR WAY WITHOUT MAP OR COMPASS, Harold Gatty. (0-486-40613-X)
DRAGONS, UNICORNS, AND SEA SERPENTS: A CLASSIC STUDY OF THE EVIDENCE FOR THEIR EXISTENCE, Charles Gould. (0-486-42417-0)
HUMMINGBIRDS, Crawford H. Greenewalt. (0-486-26431-9)
A MODERN HERBAL, VOL. I, Margaret Grieve. (0-486-22798-7)
A MODERN HERBAL, VOL. II, Margaret Grieve. (0-86-22799-5)
FRUIT KEY AND TWIG ICEV TO TREES AND SHRUBS, William M. Harlow. (0-486-20511-8)
TREES OF THE EASTERN AND CENTRAL UNITED STATES AND CANADA, William M. Harlow. (0-486-20395-6)
MANUAL OF THE GRASSES OF THE UNITED STATES, VOL. 2, A. S. Hitchcock. (0-486-22718-9)
Copyright © 1942, 1957 by William M. Harlow.
All rights reserved.
This Dover edition, first published in 1957, is a corrected republication of the work originally published in 1942 by the McGraw-Hill Book Company under the title Trees of the Eastern United States and Canada.
Library of Congress Catalog Card Number: 57-4601
International Standard Book Number
9780486138268
Manufactured in the United States by Courier Corporation
20395634
www.doverpublications.com
To
WILLIAM GOULD VINAL
NATURE GUIDE AND FRIEND
PREFACE
General interest in trees and forests has recently been stimulated by a new realization of their importance in erosion control and water storage, as cover for wild life, to the camper and hiker, and as a continuing source of wood and other raw materials. Many people for the first time have found that trees, their recognition and life histories, may prove to be a fascinating lifelong hobby. Few of these, however, are prepared or inclined to pursue a course in botany in order to learn the names and distinctive features of their common trees.
Most tree books are written by systematic botanists who feel that anyone who really wishes to know the trees should first learn the scientific language of the botanical fraternity. While it is true that this is the best way to train a specialist, it seems very doubtful whether the average hobbyist, hiker, camper, or woodcrafter should be expected to learn and ferret out the meaning of a large number of terms, such as polygamodioec-ious, zygomorphic, glaucescent, exocarp, and verticillate, before getting acquainted with the common trees. The specialist will argue that each of these terms has a definite and precise meaning which is necessary to describe properly the various plant parts. Although this is true, the author hopes to show how easy it is for the amateur to get along with the barest minimum of such terms, and how most trees can be recognized without using any of them.
Rediscovering through early writers some of the pioneer uses of our trees and their peculiar features of value to the woodcrafter has been a real pleasure. Comments or suggestions in this direction will be appreciated. Finally, wildlife uses have been included, for the most part taken from Van Dersal’s compendium (see page 278), and bulletins of the Lakes States Forest Experiment Station. A large share of the illustrations have been adapted by slight reduction from those in Textbook of Dendrology
by W. M. Harlow and E. S. Harrar.
WILLIAM M. HARLOW
Table of Contents
DOVER BOOKS ON PLANTS AND ANIMALS
Title Page
Copyright Page
Dedication
PREFACE
INTRODUCTION
THE CONIFERS OR SOFTWOODS
THE BROADLEAVED TREES OR HARDWOODS
INDEX
A CATALOG OF SELECTED DOVER - BOOKS IN ALL FIELDS OF INTEREST
INTRODUCTION
What Is a Tree?—There are surely many answers. To the technically minded forester, it may be thought of as a factory for producing the most good timber in the least possible time at the least expense, a concept of the greatest importance to a wood-using nation like ours. But what are streets, parks, and playgrounds without trees or the home backyard without at least one tree to mark perhaps the change of seasons with its swelling spring buds, early summer flowers, and brilliant autumn leaves?
Trees are like children; they have a chance of living long after us. Plant an acorn where you live, and in ten years you will have become so attached to the young oak tree that you won’t want to move away. A treeless world would be a sad as well as a difficult place in which to live. But once, within the memory of people still living, a great hardwood forest stretched from the Atlantic to the Great Plains, in some places so thick that one hardly could see the sun from the time when the leaves came out in spring until they fell in autumn. Then the cry was let daylight in the swamp,
and a generation of pioneers and lumberjacks felled the great trunks and often burned them to get them out of the way. That era is now past, and the forester is beginning to take over.
Trees are woody plants, and a woody plant is one that has a persistent stem above ground and does not wither or die back in autumn at the first heavy attack of frost. The other seed plants, with their predominantly soft tissues, are the common herbs of every description.
Just how large a woody plant must be to qualify as a tree is a matter of opinion. Here it is defined as reaching, when full grown, a height of at least 20 ft, with a single stem or trunk and a more or less definite crown shape. Shrubs in contrast are smaller, with several stems and no particular crown shape.
Tree Shapes.—When grown in the open, the crowns of trees tend to develop characteristic shapes: Elms are vaselike; oaks are wide-spreading; hickories often oblong; etc. At the same time, the trunks are usually short, and side branches persist nearly to the ground. Such trees make poor lumber because of the limby, hence knotty, logs obtainable. Only by competition are long clear trunks built; and at the same time, the crowns are restricted and not so typically shaped as they are in the open. At this point it should be mentioned that the maximum height and diameter for a certain kind of tree are rarely if ever from the same individual. A tree that reaches the greatest height for its kind is usually smaller in diameter than one showing the maximum size across the stump.
What Is a Species?—Since the word is so frequently used, its meaning should be made as clear as possible. The dictionary says that a species is a group of individuals agreeing in common attributes and called by the same name. For instance, all the five-needled pine trees of the northeast happen to be of the same kind and are all called white pine. Or a species is a group of individuals enough alike so that they might have come from the same parents. If any of you are familiar with large families, you know how much brothers or sisters may vary in looks, to say nothing of other characteristics. Therefore botanists may not agree as to the classification of certain trees. For instance, some think that black maple is a separate species of tree; others say that it is so similar to sugar maple that it should be only a variety of the latter.
Species are grouped together, and one of these larger groups is called a genus (pl. genera), e.g., pine, oak, maple, ash. Related genera are combined to make families, and so on.
Finally, there is no such thing as specie
connected with the names of trees. Specie is hard cash,
or coined money. The singular of the word species is also species; some amateurs and poorly trained writers on trees notwithstanding.
What Tree Makes the Best Firewood?—In camp, we usually want a quick hot blaze for such things as boiling the kettle, or a smokeless bed of coals that will hold its heat sufficiently long for broiling or like purposes. Different woods behave quite differently in this respect; but rather than learn a whole list of species together with their properties, a few principles will serve. It is assumed that the wood is all air dried to about the same moisture content; and in some of the conifers, differences in amounts of resin must be considered. But as a rule the following is true.
In the first group are such trees as beech, hickory, sugar maple, and white ash; in the second, poplar, basswood, spruce, and pine. Furthermore, the wood of the conifers is not suitable except for kindling (where it is ideal) because it shoots out hot sparks (especially hemlock) which may damage tents or bedding.
Tree Names.—Someone has said that trees and other plants have nicknames
and real names.
The nicknames are known to those popularly referred to as laymen, whereas botanists and others with a more technical interest use the real (or scientific) names, which are in Latin. The principal objection to the former is the lack of universal agreement as to what should be the name of a given tree, and some trees may have from 10 to 25 different common names, depending on the locality where found. Although most people may have little use for the Latin names, they are included to protect the author in matters of species identification. A few of the longer names will be found very useful as jawbreakers.
In most cases the common and scientific names are those now recognized by the U.S. Forest Service.
How trees get their common names provides an interesting study in pioneer culture, since they were mostly named early in our history.
SOME REASONS FOR CERTAIN TREE NAMES
Use: sugar maple, paper mulberry, tanbark oak
Habitat: river birch, swamp white oak, water elm
Some distinctive feature: white birch, trembling aspen, shagbark hickory
Region: Virginia pine, Ohio buckeye, northern red oak
Nanaes from other languages: Chinkapin oak (Indian for chestnut)
Named after someone: Douglas-fir, Engelmann spruce.
A Survey of Tree Terms
Many precise botanical terms are used to describe tree parts, but only a few are necessary to identify the common native trees.
Principal Kinds of Trees.—As we walk in the woods and look about us, it soon becomes clear that there are two great races of trees quite different from each other. First there are trees such as the pines, spruces, and hemlocks-cone bearers with needlelike or narrow leaves which stay on for more than one year, so that we call them evergreens-and, second, maples, birches, and others with large, spreading leaves that fall each autumn (deciduous). Woodsmen usually speak of the evergreens as softwoods and the broadleaved trees as hardwoods. Although it is true that the wood of some pines, spruce, and balsam is soft and that of oak and maple is hard, it is also true that the wood of the southern pines is harder than that of poplar or basswood (broadleaved). Moreover, the larches (cone bearers with narrow leaves) lose their leaves each fall and are bare all winter; and yew trees, although having evergreen foliage, bear a peculiar fleshy fruit instead of a cone. Finally a few of the broadleaved trees have evergreen leaves.
However, these are the exceptions, and in general we can use such terms if we remember their limitations.
Leaves.—After noticing whether the leaves are evergreen or deciduous,¹ the next item to observe is whether they are simple (one blade) or compound (several blades) (see Plate 1). To find out how much of a mass of foliage is a single leaf, start at the tip of what seems to be a leaf and follow it toward the tree until you come to a woody stem or, except in the late spring, a bud. ² Break off everything to this point, and you will have a complete leaf. In a few cases, like the Kentucky coffeetree, a single leaf is 2 to 3 ft. long with dozens of blades arranged on a branched framework. Compound leaves with the blades (leaflets) all radiating from a single point are called palrnate; those arranged on both sides of a central stem, pinnate. If the central stem is branched, the leaf is then twice, or doubly compound, a relatively rare thing.
PLATE 1.—Kinds of leavee.
PLATE 2.—Leaf arrangement.
Most trees have alternate leaves, occurring singly in spirals (Plate 2); in a few groups, the leaves are paired (opposite) or rarely in threes (whorled). An easy way to remember those with opposite leaves (with one or two exceptions) is to repeat madcap horse.
Here the m
stands for maple; the a
for ash; the d
for dogwood (one exception); the cap
for Caprifoliaceae, or honeysuckle family, containing a few small trees and many shrubs; and the horse
for horse chestnut (including the buckeyes).³
In a few alternate-leaved trees, adjacent leaves tend to become paired or staggered, a condition called subopposite (purple willow and buckthorn are the only ones included that show this feature). Sometimes alternate leaves may look opposite or whorled because they are on a very slow-growing branchlet or spur (see birches and cherries especially). Because of this, always look at reasonably fast-growing twigs to determine the arrangement.
Strange as it may seem, these alternate leaves are not stuck on any which way
but are borne in almost mathematical precision. If within the same season’s growth, you will pick out two leaves one of which is exactly above the other, you can prove that this is so. First, starting with the lower leaf, spiral around the twig, touching in turn each leaf stem or bud as you pass until you get to the second leaf chosen. In so doing you will probably have made one, two, or (very rare in broadleaves) three complete turns around the twig. Write this number down, and draw a line below it. Now go back; and without including the lower of the two leaves, count all the leaves passed, up to and including the second one of the pair originally chosen. Put this number below the line, and a fraction representing leaf arrangement results.
The arrangements represented by these fractions are typical of certain trees. For instance, elms are 1/2; alders 1/3 (rare type); and oaks 2/5.
The series 1/2, 1/3, 2/5, 3/8, 5/13, etc., is named for its Italian discoverer Fibonacci and shows some peculiar relationships. The added numerators of the first two terms equal the numerator of the third; the added denominators of the first two equal that of the third; etc. There are other relationships if you look for them.
When first appearing in the spring, the leaves of certain trees are accompanied by a pair of little leaves
(stipules) attached to the twig at the base of the leaf stem. These usually fall soon but leave scars useful in twig identification.
PLATE 3.—Leaf shapes.
Leaf Shapes (Plate 3).—Some of the commonest are
Circular
Oval⁴
Elliptical
Egg-shaped (ovate)
Lance-shaped
Triangular
Diamond-shaped
Heart-shaped
Leaf Margins.—The type of margin is one of the best features for recognizing leaves (Plate 4). It may be (1) smooth; (2) wavy; (3) toothed, with sharp (serrate) or rounded (crenate), fine or coarse teeth; in the latter case, each large tooth may again bear smaller teeth; (4) doubly toothed. When the spaces between the teeth run one-third or more to the center of the leaf, it is then called (5) lobed.
Leaf Surfaces.—Sometimes these are characteristic. Most leaves are smooth and green, but some bear a whitish bloom (which can be rubbed off with the finger) on the undersurface; others are hairy or velvety; and in a few, like those of slippery elm, the upper surface is rough, feeling like a piece of sandpaper.
PLATE 4.—Leaf margins.
Flowers.—Except in such trees as the tulip and magnolia, tree flowers are often inconspicuous. Who, for instance, has seen the flowers of white cedar, spruce, or elm? Moreover, flowers are available only for a short time, and whole seasons may pass without any developing at all. For these reasons, they are not of so much practical value in tree identification as are other features. However, to botanists they are of prime importance in tracing relationships between trees and tree groups; and to the miniature camera enthusiast equipped to take close-ups at an initial magnification of three to four times natural size, they offer a whole new world to explore. Many of them are not only grotesque but, in some instances, extremely colorful as well.
PLATE 5.—Flower structure.
The essential parts of a flower are (1) the stamens (pollen-bearing organs) and (2) the pistil(s) (receptive to the pollen and containing in its base the egg that later when fertilized becomes the seed). When both stamens and pistil(s) are found in the same flower, it is said to be perfect (Plate 5). But in some trees, the