Trees Worth Knowing Part 28

The pines and their relatives in the coniferous group are an ancient race, composed of proud old "first families." Along the sh.o.r.es of the Silurian seas they stood up, straight and tall, their only companions that stood erect, the giant horse-tails and tree ferns.

This was long before modern tree families had any existence. There were no broad-leaved trees. In the coal measures are found the mummied remains of these prehistoric conifers. The cycads in the Everglades of Florida are some of their surviving representatives.

These are facing extinction, and the conifers, too, are declining.

They had reached their prime as a race when the broad-leaved trees appeared upon the earth. The vigor of the new race enabled it to seize the richest, well-watered regions. They drove the conifers to seek the swamps, the exposed seacoasts, the barren and rocky mountain slopes. Man has ruthlessly destroyed for timber the coniferous forests of this country and much of the territory denuded by the axe is either devoted to agriculture or has been seized by broad-leaved species of trees, more tenacious of life and with seeds more quick and sure to germinate than those of the conifers. The time is not far distant, geologically speaking, when this ancient and declining family of trees will exist only as man fosters it by cultivation.

The conifers have resinous wood, with stiff, needle-like or scale-like leaves, and inconspicuous flowers of two sorts, borne in cl.u.s.ters like catkins. The pistillate catkin matures into a woody cone made of overlapping scales attached to a central stem. On each scale are borne one or more winged seeds.

The one character which is constant in the whole coniferous group and sets it apart from the rest of the plant kingdom, is expressed in the name _Gymnosperm_, applied to this botanical grand division.

It means "naked seed." There is no ovary in the flower. The naked ovules are borne on the scales of the fertile spike or catkin, which is held apart and erect in blossoming time. They are pollinated by the wind, which sifts them with golden pollen dust, abundant in the staminate catkins cl.u.s.tered on the same tree. Contact of pollen grains and naked ovules is followed by their coalescence--the "setting of seeds."

The distinguis.h.i.+ng trait of the higher plants that form the grand division known as _Angiosperms_, is that the ovules are borne in a closed ovary, and the pollen lodges on the end of a stigma. "Pollen tubes" grow down through the long style, finally reach the hidden ovule, and seed is set. This complicated process is found in the majority of flowers one studies in botany cla.s.ses. Gymnosperms, and the still lower groups of flowerless ferns and mosses, are merely glanced at by amateur botanists. The more primitive plant forms are too difficult for beginners.

The habit of the conifers is a character upon which we may depend.

With rare exceptions, there is a central shaft, "the leader," and short horizontal branches in whorls forming platforms. The side branches, also whorled, are generally flattened into a horizontal spray. The leaves are narrow, needle-like, or scale-like, and waxy or resinous. The tough fibre of the wood enables the conifers to resist damage by wind and by ice. Snowflakes sift to the ground instead of acc.u.mulating upon the branches and breaking them by their c.u.mulative weight. The wind, which pollinated the fertile flowers of coniferous forests long before nectar-gathering insects came upon the earth, is the harvester of their seeds. It scatters them far and wide; each seed has a wing that adapts it to long journeys in front of a gale.

The resinous sap that courses through the veins of coniferous wood seals up the bark, leaves, and cones against the invasion of enemies, and acts as an antiseptic dressing for wounds. Without these special adaptations to a life of hards.h.i.+p, the conifers would never have held their own as they have done. They inhabit regions where conditions discourage all but a few of the broad-leaved trees.

THE PINES

In a forest of needle-leaved evergreens it is perfectly easy to distinguish the pines by their leaves. Look along the twigs and you will find the needles arranged in bundles, with a papery, enclosing sheath at the base. Follow farther back and these sheaths are missing, but on long stretches between the growing tip and the leafless part of the branch the characteristic sheathed needle-bundles declare this evergreen to be a pine. No other conifer has this trait, no pine grows but shows it every day in the year.

One half of the eighty known species of pines grow in North America.

Pure forests of great extent are found in the Southern states, in the Great Lakes region, and on the mountain slopes in the western and northern parts of the continent. Smaller areas occur in the Eastern states. Very soon these forests must be spoken of in the past tense, for a century of destructive lumbering has almost cleared the Northeast of pine timber, and though the exploitation of the pine forests of the South and about the Great Lakes came later, as population increased in the Middle West, the work has progressed much more rapidly. The idea of forest conservation, crystallized into federal law by popular demand, has come too late to save from wasteful exploitation the superb pine forests west of the Rockies.

Yet thousands of acres of forests are now under government control and here a great object lesson in rational methods of forest maintenance is being given. The pineries of the future depend upon the success of methods there employed.

The uses of pines are not all counted in terms of the lumberman.

There are pines for every situation, soil, and climate. On low seaboard plains they come down to the highwater mark. They wade into inundated swamps and climb to the timber line on arid, rocky mountain-sides. The bravest species go out into the desert. Almost as brave are those which survive the smoke and dust of cities like Pittsburg and St. Louis, though theirs is a losing fight with sulphurous fumes and cramped root s.p.a.ce in the smoky town. As shelter belts, as wind-breaks, as shade and ornamental trees, there are pines in cultivation in all parts of the country, their winter usefulness and beauty making them universally the choice of home-makers, rich and poor.

By-products of pine wood are chiefly turpentine, pitch, resin, and oil, derived from the resinous sap. "Naval stores" these products are called, for their consumption is greatest in s.h.i.+pyards.

Turpentine is extensively used in the arts and industries. If the Southern pine forests are allowed to dwindle, the deficit in lumber will not affect world commerce as disastrously as the cutting off of the naval stores production.

The lumberman's division of the pines is a convenient one. "Soft pines" have soft, light wood, not heavily impregnated with resin. It is the delight of wood-workers. "Hard pines" have heavy, dark-colored wood, full of resin, which is a nuisance to the carpenter, because it "gums up" his tools. The one little sign enables us to distinguish hard and soft pines without examination of the wood. Soft pines shed the papery sheath of their leaf bundles before the leaves themselves begin to fall. Hard pines retain the leaf sheath until the leaves are shed. A glance at any leafy pine branch will enable us to determine to which of the two cla.s.ses a given tree belongs.

THE SOFT PINES

The outward and visible sign of a soft pine is the loose, deciduous sheath of its leaf bundles. The scales of its cones are usually unarmed with horns or p.r.i.c.kles. The wood is soft, light colored, close-grained. The number of leaves in a bundle is the princ.i.p.al key to the species.

=The White Pine=

_Pinus Strobus_, Linn.

The white pine (_see ill.u.s.trations, pages 214-215_) is the only pine east of the Rocky Mountains that bears its leaves in bundles of five. This semi-decimal plan is found in three western soft pines and two western hard pines; but in the East, a native tree with needles in fives, leaves no doubt as to its name. From a distance this plan of five can be seen in the five branches that form a platform each year around the central shaft.

Study a sapling pine and you see in its vigorous young growth the fulfillment of nature's plan, before storms have broken any of the branches and changed the mathematics of the pattern. Stroke the flexible, soft leaves that sway graceful and lithe in the wind. If it is spring, note that the terminal bud has pushed out, and around it five-cl.u.s.tered buds are forming a circle of shoots. In autumn, after the season's growth is finished, each twig ends in a single bud, with a whorl of five buds around it. From the ground upward, count the platforms of branches. Each whorl of five marks a year in the tree's growth. The terminal bud carries the height a foot or two upward, and its surrounding five buds grow in the horizontal plane, forming the last and smallest platform of leafy shoots. Each branch is a year younger than the shoot that bears it. Note throughout this little tree the plan of five, from leaf cl.u.s.ter to largest branch.

Now go to the largest white pine in your neighborhood, study the plan of five in this tree, and find out the reason for any failures.

Notice the conflict between the branches in the close platforms.

Find branches where this conflict is in progress. Pick out the winner. Read the age of the tree by the platforms of branches on the trunk.

No evergreen is more beautiful than a white pine grown in rich soil in a situation sufficiently sheltered to defend its supple branches from breakage by severe winds. Its soft, plume-like twigs are dark blue-green, with pale lines lining each individual leaf. The young shoots are yellowish green, and they lighten in a wonderful manner the sombre coloring of the older foliage. At the bases of the new shoots cl.u.s.ter the staminate catkins, in early June. Yellow and becoming loose and pendulous as the wind shakes them, they are soon empty of their abundant pollen, which drifts like gold dust and fills the air. Among the youngest leaves, toward the end of the shoot, the purplish rosy lips of the erect pistillate cone-flowers catch the dust from neighbor trees, and their naked ovules absorb it and set seed. Close shut are the lips again, against any other invasion, while these ovules mature. We shall find them standing erect until autumn, but next season they hang down with their added weight, and at the end of the second summer the scales change from green to brown, open and give their ripe winged seeds to the wind for distribution. Because the tree is biennial-fruited, it always carries two sizes of cones. The large ones are one year older than the small ones. Ripe cones are five to ten inches long, with thin, broad, unarmed scales, squarish at the tips.

The most hopeful phase of the white pine problem to-day is the fact that new forests are coming up naturally where the early lumbering deforested great tracts in the Eastern states. Careful forestry improves upon nature's method, and so the pines are being restored on land unfit for agricultural crops. White pine is one of the most profitable timber crops to plant at the present time.

=The Mountain Pine=

_P. monticola_, D. Don.

The mountain pine is scattered through mountain forests from the Columbia River Basin in British Columbia to Vancouver Island, along the western slopes of the Rocky Mountains to northern Montana and Idaho, and south along the Sierra Nevada and Cascade ranges in Was.h.i.+ngton and Oregon, well into California. From the bottom lands of streams, where it is most abundant and reaches a height of one hundred to one hundred and fifty feet, and a trunk diameter of five to eight feet, it climbs to elevations of eight to ten thousand feet on the California Sierras. The bark of young trees and on the branches of old ones is smooth and pale-gray. The leaves, five in the bundles, range from one to four inches in length, stiff, blue-green, whitened by two to six stripes on the inner side. The cones are twelve to eighteen inches long, with thickened, pointed scales ending in an abrupt beak. The larger cone, denser, stiffer foliage, and the white bark make this white pine of the western mountains a great contrast to the Eastern white pine.

Unlike many trees whose size diminishes with increase in alt.i.tude, this white pine grows to majestic size at alt.i.tudes of nearly two miles, its n.o.ble figure more striking and impressive because of the dwindling size of its companions on the mountain-sides. The lumberman looks with despair upon these giant white pines, quite out of his reach.

In the Arnold Arboretum in Boston a fine seedling specimen of this western silver pine fruited when but twelve feet high, and proves vigorous and altogether happy in this absolutely changed climatic environment. In Europe the same success attends the cultivation of these trees, which have become very popular in parks and private grounds. Their introduction into our Eastern states can now be a.s.sured of success.

=The Sugar Pine=

_P. Lambertiana_, Dougl.

The sugar pine (_see ill.u.s.tration, page 231_) belongs in the cla.s.s with those tree giants, the sequoias, with which it grows in the mountain forests of Oregon and California. John Muir calls it "the largest, n.o.blest, and most beautiful of all the pine trees in the world." Trees two hundred feet high, with trunk diameter of six to eight feet, are not uncommon. The maximum given by Sargent is twelve feet across the stump. The head of a sugar pine is rounded and broad, with pendulous branches, tufted with stout, dark green leaves, three to four inches long. The cones are the largest known, reaching eighteen inches in length, rarely longer. The black or dark brown seeds are one to five inches long, including the flat, blunt wings. Indians, bears, and squirrels gather the abundant harvest of these cones, which are rich in nutriment and pleasant to the taste.

Crystals of sugar form white ma.s.ses like rock candy, but with a taste of maple sugar, wherever a break in the bark of a sugar pine permits the escape of the sweet sap. This gives the tree its name.

No other pine has sap with such a noticeable sugar content.

Fortunately, these gigantic soft pines belong to the high Sierras and do not go down to the sea, where lumbermen could sacrifice them without effort. Nature has fenced them in by many barriers, and the government, by reservation in national parks, insures the preservation of some of the finest sugar pine groves, for the use and inspiration of all the people.

A visit to Yosemite is the experience of a lifetime to any American.

Here grow the most gigantic trees in the world, and the sugar pines are n.o.bler even than the giant "big trees," for the latter are often decrepit, while the sugar pines are hale and youthful by comparison.

Leaving behind the scrawny gray digger pines on the foothills, the traveler enters the belt of the yellow pines, on the higher elevations, and pa.s.sing these he comes to the grand sugar pines along the highest level of the stage road that leads into the National Park. The road is no wider than the broad stumps of sugar pines, scattered here and there. The standing trees amaze one with their height and girth.

It is impossible to shake off the impression that some magic has put magnifiers in our eyes; for trees, beetling cliffs, and rus.h.i.+ng cataracts are bigger than their counterparts in other regions of the world far-famed for their scenery. The sugar pine trunks seem like great builded columns, too large for any real tree to grow, and the "big trees" in the Mariposa Grove intensify this impression of unreality. In a day or two the traveler becomes accustomed to his surroundings. He goes out of the Park and down into the world of men and affairs, his soul enlarged, his life enriched by an experience he can never quite forget. He is a bigger, better man for his brief a.s.sociation with Nature in her n.o.blest manifestations.

The wood of the sugar pine is soft, golden, satiny, fragrant, inviting the woodworker through every one of his senses. A single tree often yields five thousand dollars' worth of marketable lumber, the finest, straight-grained soft pine in the world.

The shame of the century is the wanton destruction of sugar pine trees by vagrant s.h.i.+ngle-makers and thieving mill-owners, who despoiled the grandest trunks of their choicest wood, wastefully leaving the bulk to c.u.mber the ground and invite forest fires. Late and slowly, but surely also is the popular mind awakening to the fact that forests belong to the nation and should be conserved and maintained for the whole people--not wasted for the temporary enrichment of private owners, as forest wealth has been squandered in past years.

=Rocky Mountain White Pine=

_P. flexilis_, James

The Rocky Mountain white pine inhabits mountain slopes from Alberta to Mexico, including the Sierra Nevada range. In northern New Mexico and Arizona it occasionally reaches eighty feet in height, but ordinarily does not exceed fifty. Its rounded dome, as broad as an oak, bravely dares the wind on exposed cliffs, and crouches as a stunted shrub at alt.i.tudes of twelve thousand feet. The "limber pine" it is called, from the toughness of its fibre, which alone enables its long limbs to sustain the whipping they get. The leaves form thick, beautiful dark-green tufts, which are not shed until the fifth or sixth year. The cones are three to ten inches long, purplish; scales rounded, abruptly beaked at the apex; narrow wings entirely surround the seeds, which fall in September.

This is the lumber pine of the semi-arid ranges of "The Great American Desert"; the main dependence of builders, too, on the eastern slopes of the Rockies in Montana.

=The White-bark Pine=