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Acer saccharinum
Least Concern (IUCN 3.1)^[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Sapindales
Family:	Sapindaceae
Genus:	Acer
Section:	Acer sect. Rubra
Species:
Binomial name
*Acer saccharinum* L. 1753
Natural range of Acer saccharinum
Synonyms^[2]
Acer coccineumWender. 1831 not F. Michx. 1817 Acer dasycarpumEhrh. Acer eriocarpumMichx. Acer paviaDippel Acer sairaK.Koch Acer tomentosumDesf. Acer virginianumMill. ex Steud. Argentacer saccharinum(L.) Small Saccharodendron saccharinumNieuwl. Sacchrosphendamnus saccharinusNieuwl.

Silver Maple twig and buds

Acer saccharinum, commonly known as silver maple,^[3]creek maple, silverleaf maple,^[3]soft maple, large maple,^[3]water maple,^[3]swamp maple,^[3] or white maple,^[3] is a species of maple native to the eastern and central United States and southeastern Canada.^[3]^[4] It is one of the most common trees in the United States.

Although the silver maple‘s Latin name is similar, it should not be confused with Acer saccharum, the sugar maple. Some of the common names are also applied to other maples, especially Acer rubrum.

Description[edit]

Silver maple leaf

The silver maple tree is a relatively fast-growing deciduoustree, commonly reaching a height of 15–25 m (49–82 ft), exceptionally 35 m (115 ft). Its spread will generally be 11–15 m (36–49 ft) wide. A 10-year-old sapling will stand about 8 m (26 ft) tall. It is often found along waterways and in wetlands, leading to the colloquial name 'water maple'. It is a highly adaptable tree, although it has higher sunlight requirements than other maple trees.

Silver maple leaves

The leaves are simple and palmately veined, 8–16 cm (3¹⁄₄–6¹⁄₄ in) long and 6–12 cm (2¹⁄₄–4³⁄₄ in) broad, with deep angular notches between the five lobes. The 5–12 cm (2–4³⁄₄ in) long, slender stalks of the leaves mean that even a light breeze can produce a striking effect as the downy silver undersides of the leaves are exposed. The autumn color is less pronounced than in many maples, generally ending up a pale yellow, although some specimens can produce a more brilliant yellow and even orange and red colorations. The tree has a tendency to color and drop its leaves slightly earlier in autumn than other maples.

Samaras and leaves forming in April

The flowers are in dense clusters, produced before the leaves in early spring,^[5] with the seeds maturing in early summer. The fruit are samaras, each containing a single seed, and winged, in pairs, small (5–10 mm or 0.20–0.39 in in diameter), the wing about 3–5 cm (1¹⁄₄–2 in) long. The fruit are the largest of any native maple. Although the wings provide for some transport by air, the fruit are heavy and are also transported by water. Silver maple and its close cousin red maple are the only Acer species which produce their fruit crop in spring instead of fall. The seeds of both trees have no epigeal dormancy and will germinate immediately. Seed production begins at 11 years of age and large crops are produced most years. Like most maples, silver maple can be variably dioecious (separate male or female trees) or monoecious (male and female flowers on the same tree) but dioecious trees are far more common. They can also change sex from year to year.

On mature trunks, the bark is gray and shaggy. On branches and young trunks, the bark is smooth and silvery gray.

Cultivation and uses[edit]

Typical yellow autumn leaf color

Atypical reddish autumn color; this sort of coloration is sporadic and uncommon

Wildlife uses the silver maple in various ways. In many parts of the eastern U.S., the large rounded buds are one of the primary food sources for squirrels during the spring, after many acorns and nuts have sprouted and the squirrels' food is scarce. The seeds are also a food source for squirrels, chipmunks and birds. The bark can be eaten by beaver and deer. The trunks tend to produce cavities, which can shelter squirrels, raccoons, opossums, owls and woodpeckers.^[6] Additionally, the leaves serve as a source of food for species of Lepidoptera, such as the rosy maple moth (Dryocampa rubicunda).^[7]

Native Americans used the sap of wild trees to make sugar, as medicine, and in bread. They used the wood to make baskets and furniture.^[6] An infusion of bark removed from the south side of the tree is used by the Mohegan for cough medicine.^[8]

Today the wood can be used as pulp for making paper.^[9] Lumber from the tree is used in furniture, cabinets, flooring, musical instruments, crates, and tool handles, because it is light and easily worked. Because of the silver maple's fast growth, it is being researched as a potential source of biofuels.^[6] Silver maple produces a sweet sap but it is generally not used by commercial sugarmakers because its sugar content is lower than in other maple species.^[10]

Silver maple bark

Silver maple is often planted as an ornamental tree because of its rapid growth and ease of propagation and transplanting. It is highly tolerant of urban situations and is frequently planted next to streets. However, its quick growth produces brittle wood which is commonly damaged in storms. The silver maple's root system is shallow and fibrous and easily invades septic fields and old drain pipes; it can also crack sidewalks and foundations. It is a vigorous resprouter, and if not pruned, will often grow with multiple trunks. Although it naturally is found near water, it can grow on drier ground if planted there. In ideal natural conditions, A. saccharinum may live up to 130 years but in urban environments often 80 or less.

Following World War II, silver maples were commonly used as a landscaping and street tree in suburban housing developments and cities due to their rapid growth, especially as a replacement for the blighted American elm. However, they fell out of favor for this purpose because of brittle wood, unattractive form when not pruned or trained, and tendency to produce large numbers of volunteer seedlings. Today the tree has fallen so far out of favor that some towns and cities have banned its use as a street tree.^[11]^[12]

Silver maple's natural range encompasses most of