BLACK WILLOW
(Salix Nigra)
The willows and the cottonwoods belong to the same family of trees, SalicaceÆ, and the family is fairly numerous, and it has some well-defined traits of character. The quinine-bitter of the bark is ever present, but more marked in willows than in cottonwoods. Though quite unpleasant to the taste, it is harmless. The leaves never grow in pairs, and in most instances they fall early in autumn, and some without changing color. Male and female flowers are borne on different trees, and fertilizing is done by insects, often by honey bees and bumblebees. Fruit ripens in late spring, and the seeds are equipped for flight by being provided with exceedingly fine silky hairs. The wind carries them long distances. The trees generally grow in the immediate vicinity of streams or in situations where the soil is damp, but there are exceptions.
The willow family consists of two genera, one the cottonwoods or poplars, the other the willows proper. There are about seventy-five species of willow in America, twenty of them trees. Some, however, are quite small and only occasionally attain sizes which place them in the tree class. The willows are old residents of this continent. They grew in the central portion of what is now the United States in the Cretaceous age, as is proved by their leaf prints in the rocks. They have held their ground ever since, and there is no likelihood that they are about to give it up. Few species are better fitted for holding what they have. A few trees are capable of seeding a large region in a few years, and if soil and situation are suitable, reproduction will be abundant. The willows’ tenacity of life is often remarkable. It sometimes seems next to impossible to kill them by cutting off their tops. There are said to be instances in Europe where willows have been pollarded successively during hundreds of years, the crops of sprouts being used for wickerwork and other purposes. No such records exist in this country, but the willow’s sprouting habit is well known. A shoot stuck in the ground will grow, and a fence post will sprout. Many willows develop large stools, or roots, and repeatedly send up numerous sprouts, and it makes little difference how often they are cut, others will come up.
Comparatively few willows that start in life ever become trees. They are suppressed by crowding, or meet misfortunes of one kind or another which keep them small, but occasionally a tree of good size results. Willow trees are usually not old. Probably few reach an age exceeding 150 years. Large trunks, in old age, are apt to be hollow or otherwise defective, though a willow tree will live many years after much of its trunk has disappeared. A little green bark on the side, and sprouts from the stump will maintain life long after all usefulness has ceased.
Young willows are usually pliant and tough, old are stiff and brash. They range from sea level up to 10,000 feet or more; grow profusely in the wet lands about the gulf of Mexico, and likewise on the bleak coasts of the Arctic ocean. Commander Peary found willows blooming in considerable profusion on the extreme northern shore of Greenland, where they produce enough growth during the few weeks of summer sunshine to afford the muskox the means of eking out a living during his sojourn in those inhospitable regions.
The identification of willows is one of the most difficult tasks that fall to the botanists. Black willow is unquestionably the most important willow in this country from the lumberman’s standpoint. It is the common tree willow that attains size suitable for sawlogs. If a forest grown willow of large size is encountered east of the Rocky Mountains in the United States, it is pretty safe to class it as black willow. There are some others which grow large, but not many. Planted willows, both large and small, may be foreign species, and white willows, which are not native in this country, but have been widely planted, and are running wild, may be occasionally found of ample size for saw timber.
Black willow’s range extends from New Brunswick to Florida, west to the Dakotas, and south to Texas, thence passing into Mexico, New Mexico, Arizona, and California. It attains its best size in the Ohio and Mississippi valleys, though large trees are found in other parts of its range. It is difficult to say what its average size is, for some black willows are only a few feet high and an inch or two in diameter. The largest trees exceed 100 feet in height and three in diameter. An extreme size of seven feet in diameter has been reported. It is not unusual to see willow logs three feet in diameter in mill yards in Louisiana, Mississippi, and Arkansas, and logs four feet in diameter are not so unusual as to excite much comment. The average sizes, however, of willow sawlogs in that region are from eighteen inches to two feet.
The wood of black willow is pale reddish-brown. When freshly cut it is sometimes purple, almost black. When sawed in lumber and exposed to the air the dark color fades. The wood is soft but firm. It has about fifty per cent of the strength of white oak, and forty per cent of its stiffness. It weighs 27.77 pounds per cubic foot; and considering its weight, it is tolerably strong and stiff.
Probably no other wood in the United States is as systematically cheated out of its just credit as this one. Many of the oaks are seldom given their proper names, but they are listed as oak in sawmill output, and thus the genus, if not the species is given credit. But willow is almost totally ignored. The United States census in 1910 credited to all the willow lumber in this country an amount less than a million and a half feet; yet a single mill in Louisiana, and not a large mill at that, cut and sold four times that much during that year. The wood was cut by hundreds of other mills, some a few logs only, others considerable quantities.
It is sold for various purposes, and much of it goes as cottonwood. In some instances it is called brown cottonwood. Probably ninety per cent is made into boxes, but it has many other uses. It is cut into excelsior, made into rotary cut veneer, and finds place in the manufacture of furniture; it is a common woodenware material; slack coopers make barrels of it; and it is turned for baseball bats.
The supply of black willow in this country is not small. It is usually found in wet situations along streams. Sometimes islands and low flats are taken possession of and pure stands result. The growth is sometimes phenomenal. Trunks may add nearly or quite an inch to their diameter per year when conditions are exceptionally favorable. Instances, apparently well authenticated, are reported of abandoned fields along the Mississippi, which in sixty years grew 100,000 feet of willow per acre.
Longstalk Willow (Salix longipes) sometimes grows to a height of thirty feet with a diameter of six or eight inches. Its range extends from Maryland to Texas, and is at its best in the Ozark region of southwestern Missouri and northwestern Arkansas.
Almondleaf Willow (Salix amygdaloides) grows across northern United States and southern Canada from New York to Oregon, and occurs as far south as Missouri and Ohio, and is abundant in the lower Ohio valley. At its best it is seventy feet high and two feet in diameter. The wood is light, soft, and the heartwood is brown.
Smoothleaf Willow (Salix lÆvigata) attains a diameter of one foot and a height of forty or fifty. It is a Pacific coast tree, occurring in California on the western slopes of the Sierra Nevadas up to an altitude of 3,000 feet. It is known as black willow. The wood is pale reddish-brown.
Silverleaf Willow (Salix sessilifolia) looks like longleaf willow, and though usually a shrub it sometimes is twenty-five feet high and ten inches in diameter. It grows from the mouth of the Columbia river to southern California.
Yewleaf Willow (Salix taxifolia) ranges from western Texas, through southern Arizona into Mexico and Central America. Trees are occasionally forty feet high and more than one foot in diameter. A little fuel and fence posts are cut from this willow.
Bebb Willow (Salix bebbiana) is nearly always shrubby, but occasionally reaches a trunk diameter of six or eight inches and a height of twenty feet. Its northern limit lies within the Arctic circle, its southern in Pennsylvania, Nebraska, and Arizona. West of Hudson bay it forms almost impenetrable thickets, and in Colorado it ascends mountains to elevations of 10,000 feet.
Glaucous Willow (Salix discolor), commonly known as silver or pussy willow, ranges from Nova Scotia to Manitoba, and southward to Delaware, West Virginia, Indiana, Illinois, and Missouri. It is one of the best known willows within its range, on account of its flowers which are among the earliest of the season, and very showy. The largest specimens are scarcely twenty-five feet high and twelve inches in diameter.
Mackenzie Willow (Salix cordata mackenzieana) is not abundant, and is one of the smallest of the tree willows. It is nearly always a shrub. Its range extends from California nearly to the Arctic circle, where it occurs in gravelly soil on the borders of mountain streams.
Missouri Willow (Salix missouriensis) is so named because it occurs principally in Missouri, but its range extends into Kansas and Iowa. It is occasionally forty feet high and a foot in diameter. It is used for fence posts.
Bigelow Willow (Salix lasiolepis) is generally called white willow on account of its gray bark. It occurs in California and Arizona, and at its best it is twenty-five feet high and ten inches in diameter. Some use is made of it as fuel, where other wood is scarce.
Nuttall Willow (Salix nuttallii), called also mountain willow in Montana, ranges from British America, east of the Rocky Mountains, to southern California. Its usual height is twenty or twenty-five feet, and its diameter six or eight inches. In southern California it grows 10,000 feet above sea level.
Hooker Willow (Salix hookeriana) occurs in the coast region from Vancouver island to southern Oregon, and varies in height from a sprawling shrub to a height of thirty feet and a diameter of one. Little use is made of it.
Silky Willow (Salix sitchensis), known also as Sitka willow, ranges from Alaska to southern California. The largest specimens are twenty-five feet high and ten inches in diameter. Trunks are largely sapwood and are of little commercial importance.
Broadleaf Willow (Salix amplifolia), known also as feltleaf willow, was discovered in Alaska in 1899. The leaves are woolly. The largest trees rarely exceed a height of thirty feet and a diameter of six inches. Its range extends to the valley of the Mackenzie river.
A number of foreign willows have become naturalized in the United States. Among them is white willow (Salix alba), which grows to large size, probably as large as black willow; crack willow (Salix fragilis), so named on account of the brittleness of its twigs; and weeping willow (Salix babylonica). The botanical name is based on the supposition that it was this willow, growing by the rivers near Babylon, on which the captive Hebrews hung their harps. Basket willow is planted for its osiers in several eastern states. It is not a single species, but a group of varieties developed by cultivation.
Black willow branch