|Salix subsp. var.||Willow, Osier|
Willows, sallows, and osiers form the genus Salix, around 400 species of deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions of the Northern Hemisphere. Most species are known as willow, but some narrow-leaved shrub species are called osier, and some broader-leaved species are referred to as sallow (derived from the Latin word salix, willow). Some willows (particularly arctic and alpine species) are low-growing or creeping shrubs; for example the Dwarf Willow (Salix herbacea) rarely exceeds 6 cm in 0 in height, though spreading widely across the ground.
Willows are very cross-fertile, and numerous hybrids occur, both naturally and in cultivation. A well-known ornamental example is the Weeping Willow (Salix × sepulcralis), which is a hybrid of Peking Willow (Salix babylonica) from China and White Willow (Salix alba) from Europe.
Willows all have abundant watery bark, sap which is heavily charged with salicylic acid, soft, usually pliant, tough wood, slender branches, and large, fibrous, often stoloniferous roots. The roots are remarkable for their toughness, size, and tenacity to life, and roots readily grow from aerial parts of the plant.
The leaves are typically elongated but may also be round to oval, frequently with a serrated margin. Most species are deciduous; semi-evergreen willows with coriaceous leaves are rare, e.g. Salix micans and S. australior in the eastern Mediterranean. All the buds are lateral; no absolutely terminal bud is ever formed. The buds are covered by a single scale, enclosing at its base two minute opposite buds, alternately arranged, with two small, opposite, scale-like leaves. This first pair soon fall, and the later leaves are alternately arranged. The leaves are simple, feather-veined, and typically linear-lanceolate. Usually they are serrate, rounded at base, acute or acuminate. The leaf petioles are short, the stipules often very conspicuous, looking like tiny round leaves and sometimes remaining for half the summer. On some species, however, they are small, inconspicuous, and fugacious (soon falling). In color the leaves show a great variety of greens, ranging from yellowish to bluish.
|Standard Cyclopedia of Horticulture|
Salix (ancient Latin name of willow). Salicaceae. Willow. Dioecious trees and shrubs, planted for the foliage and interesting habit, for shade, screens, and cover; flowers in catkins, mostly in spring and in many species very early.
Erect, or some arctic and alpine species prostrate, glabrous, pubescent or tomentose: lvs. simple, alternate, mostly elongated and pointed, the stipules persistent and prominent or caducous: buds with a single bud-scale: fls. in lax scaly spikes (aments or catkins), each fl. subtended by a single entire scale and nearly or quite destitute of perianth; the staminate fl. with 1,2, or 3-6 stamens; the pistillate fl. of a single pistil composed of 2 carpels and 2 more or less divided stigmas; at maturity the pistil dehisces, setting free the small appendaged seeds.—Species and species-like hybrids probably 300, widely spread in the northern hemisphere and a few in the southern hemisphere; no native species are reported in New Zeal. and Austral. In temperate regions, they are mostly plants of water-courses, shores, and swamps; but a good number run into the far N. and the high elevations where conditions of moisture are maintained. The wood is light, soft, and porous. For the staminate and pistillate fls. of willow, see Fig. 1528, Vol. III. The catkins or "pussies" are also shown in Figs. 3521 and 3522 herewith. In rare cases, a willow may be monoecious.
Many hybrids have been described based on specimens found in nature that presented characters intermediate between recognized species. Artificial hybrids have also been made between many species. The dioecious habit of the species seems to facilitate cross- pollination, and it is probable that the intermediate forms so frequently met with and designated in the monographs as varieties are natural hybrids. Upward of one hundred hybrid willows have been described as growing in Europe. Although as many or even more species occur in America, fewer hybrids have been detected here. The hybrids described as growing in America are for the most part between native species and those introduced from Europe. Because of the hybridity and the fact that the sexes are separated, the genus Salix is considered to be very critical and difficult for the systematist.
The role that the willow plays in the north temperate regions is to a certain extent analogous to that of the eucalyptus in subtropical regions; it flourishes in wet ground and absorbs and transpires immense quantities of water. It has been used to plant around cesspools for sanitary effect. But while most of the species occur spontaneously in wet ground or along stream-banks, the willows may be cultivated in various situations. The white willow (S. alba) has been used very effectively to fix stream-banks against erosion. Its root-system is very extensive and when well established withstands the effect of heavy rapid streams as well as wave-action. S. arctica and several allied species are among the few woody plants extending into extreme arctic regions. The arctic species are among the most diminutive of woody plants. As one goes south the species increase in size. Some of the species of North Temperate, Tropical and South Temperate zones are large trees. The arborescent species all form wood very rapidly. Specimens of white willow which may not be of great age look venerable from their great thickness of trunk and size of top. The wood is light in weight and color, finely and evenly porous. The wood has been extensively used in manufacture of gunpowder. It has also been used for many other purposes. Certain species have been extensively cultivated for many years in Europe for materials with which to manufacture baskets. S. viminalis appears to be the favorite species for this purpose. Basket willow is now extensively planted in central New York, and considerable manufacturing of this material is under way.
As ornamental trees the willows present little variety. The bright yellow catkins of some species are attractive in spring. They are considerably used as "nurse trees" for slower-growing trees that require partial shade while young. The red and yellow branches of certain willows are very bright and cheering in winter. The weeping forms are very popular, but they are often planted with little sense of fitness. The cultural remarks under Populus will apply to willows.
The species of willows are readily propagated by cuttings. It has been suggested that the brittleness at base of twigs of some species, notably the black willow (S. nigra), is an adaptation to facilitate the natural distribution of the species. Certain it is that twigs broken from the tree by the wind are carried down streams and, becoming anchored in the muddy banks, grow readily. It is one of the most aggressive trees in occupying such places. Willows may also be propagated by seed. The seeds are very small and contain a green and short-lived embryo. A very short exposure of the seeds to the air will so dry them out that they will not germinate. The safest way to secure seedlings is to plant the seeds as soon as the capsule opens.
Almost all willows take root very readily from cuttings or where broken branches lie on the ground. There are a few exceptions, including the Goat Willow (Salix caprea) and Peachleaf Willow (Salix amygdaloides). One famous example of such growth from cuttings involves the poet Alexander Pope, who begged a twig from a parcel tied with twigs sent from Spain to Lady Suffolk. This twig was planted and thrived, and legend has it that all of England's weeping willows are descended from this first one.
Willows are often planted on the borders of streams so that their interlacing roots may protect the bank against the action of the water. Frequently the roots are much larger than the stem which grows from them.
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Pests and diseases
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About 350, including:
Salix acutifolia - Violet Willow
Salix alaxensis - Alaska Willow
Salix alba - White Willow
Salix alpina - Alpine Willow
Salix amygdaloides - Peachleaf Willow
Salix arbuscula - Mountain Willow
Salix arbusculoides - Littletree Willow
Salix arctica - Arctic Willow
Salix aurita - Eared Willow
Salix babylonica - Peking Willow
Salix barrattiana - Barratt's Willow
Salix bebbiana - Beaked Willow
Salix boothii - Booth Willow
Salix brachycarpa - Barren-ground Willow
Salix candida - Sage Willow
Salix caprea - Goat Willow
Salix caroliniana - Coastal Plain Willow
Salix cinerea - Grey Sallow
Salix discolor - Pussy Willow
Salix eastwoodiae - Eastwood's Willow
Salix eriocephala - Heartleaf Willow
Salix exigua - Sandbar Willow
Salix fragilis - Crack Willow
Salix gooddingii - Goodding Willow
Salix hainanica - Hainan Willow
Salix helvetica - Swiss Willow
Salix herbacea - Dwarf Willow
Salix hookeriana - Hooker's Willow
Salix humboldtiana - Chile Willow
Salix humilis - Upland Willow
Salix lanata - Woolly Willow
Salix lapponum - Downy Willow
Salix lasiandra - Pacific Willow
Salix lasiolepsis - Arroyo Willow
Salix lucida - Shining Willow
Salix matsudana - Chinese Willow
Salix myrtilloides - Swamp Willow
Salix myrsinifolia - Dark-leaved Willow
Salix myrsinites - Whortle-leaved Willow
Salix nigra - Black Willow
Salix pedicellaris - Bog Willow
Salix pentandra - Bay Willow
Salix petiolaris - Slender Willow
Salix phylicifolia - Tea-leaved Willow
Salix planifolia- Planeleaf Willow
Salix polaris - Polar Willow
Salix purpurea - Purple Willow
Salix pyrifolia - Balsam Willow
Salix repens - Creeping Willow
Salix reticulata - Net-leaved Willow
Salix rosmarinifolia - Rosemary-leaved Willow
Salix scouleriana - Scouler's Willow
Salix sericea - Silky Willow
Salix serissima - Autumn Willow
Salix triandra - Almond Willow
Salix viminalis - Common Osier
|Standard Cyclopedia of Horticulture|
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- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
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