American
Basswood
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Physical Information |
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A mature American basswood is a large and stately tree
reaching 120-140 feet and 4 to 4.5 feet dbh when growing in suitable sites. Each tree
is supported by a complex of strong lateral roots which develop from a single stout root
during early development. The crown, composed of many relatively smaller and often
drooping branches, can vary from |
| The very characteristic smooth simple leaves are more or
less heart-shaped, broadly ovate, long pointed at the tips, and attached to the branch by
a long petiole. The leaves are further characterized as palmately veined with five main
veins, arranged alternately in two rows, and easily recognized by large and pointed teeth
which are often irregular in size. The leaves have usually shiny dark green upper surface
while light green to yellow and hairless beneath. American basswood has leaves
asymmetrical at the base. |
Basswood leaves,
Wayne county, MI
© Judy Kelly |
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bark is often dark and shallowly grooved, while smooth and grayish on
the upper parts. It usually becomes furrowed into narrow scaly ridges
and is characterized by its intertwined fibers that make the inner bark
tough and leathery.
The branches, growing densely and often drooping, are
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Basswood tillers, Colonial Point wooods,
May 00
© Judy Kelly |
Basswood seedling,
Colonial Point Woods,
May 2000
© Judy Kelly |
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| The five-parted flowers are very characteristic by their
fragrance that strongly attracts many pollinators, mostly bees. There are several flowers
on each cyme and can reach about half an inch. The pale yellow to yellow flowers are
blooming in late spring and early summer in drooping clusters attached to a branch
by a long stalk. |
| The round pea-like fruits of American basswood are hard,
almost nutlike, containing 1-2 seeds. The seeds are produced in good crops almost every
year. The seeds are dropped in late fall, winter, and early spring. Although they are not
dropped very far from the parent tree, it is likely that small rodents (squirrels,
chipmunks) increase the seeding distances and distribution.
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Basswood leaves & fruits,
Wayne county,MI
© Judy Kelly
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Basswood fruits, Hines
Drive, Wayne
County, MI
© Judy Kelly |
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Horticultural Information |
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American basswood produces good seed crops almost every
year and the seed-bearing age can exceed 100 years in the healthy trees. The seeds can be
dropped anytime during late fall, winter, or early spring season, and can be distributed
by winds or small rodents. In some cases, a seed can sustain dormant for as long as four
years before it germinates. The seeds geminate best in mineral soil; however, it has
been reported to be fairly common on sandy loams, loams, silt loams with clay subsoil, and
even sand dunes along Lake Michigan.
During the early part of development, the young basswoodseedlings develop a single stout root,
which is soon supplemented by many laterals in order to provide a strong support for the young tree.
The trees growth varies with the different competitors and climates; it can grow 6 inches in the
first 2 - 3 years of life in central Wisconsin, while 12 - 18 inches per year in the southern parts
of the state. Basswood is quite frequent and grows successfully in the glaciated regions on Ohio.
American basswood has an exceptional ability to reproduce
by stump sprouts. Unfortunately, these sprout stems lose vigor early and can become
defective and partially rotten. Another reason for the losses of the first-year seedlings
can be high due to animal, especially rabbit, cropping. After the first three years,
according to one study, only about 28 % of the young plants survive the competition and
some principle enemies - such as wood rooting fungi, molds, and insects, with the greatest
losses reported the first year.
The individuals that were able to overcome the challenges
of developing phase mature, and in favorable sites can reach up to 120 to 140 feet; even
though the average height is somewhat lover, 65 to 100 feet with 3 feet in diameter,
average weight 26 pounds per cubic foot, and specific gravity 0.32. It can take
approximately 150 years for the tree to reach its maximum height. American basswood has
been classified as quite tolerant but it requires light at the same time, especially young
trees.
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Distribution |
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American basswood is a tree common to northern range. It
is especially abundant toward the northwest region dominating the Maple - Basswood forests
and is common in the glaciated areas of Ohio. It grows successfully on sandy dunes along
the shores of Lake Michigan.
American basswood is the northernmost basswood species. Its natural range extends from west, New Brunswick to
southern Manitoba, and south through eastern North Dakota to eastern Kansas and
northeastern Oklahoma. In North Dakota, the extremes of minimum temperature can reach -51
degrees Fahrenheit and annual precipitation is ranging from 18 inches. The trees natural
habitats include parts of Virginia, North Carolina, eastern Tennessee, and northern
Arkansas; in North Carolina the temperature can fall down to -6 degrees and the annual
precipitation can reach 60 inches.
American basswood is most abundant in two forest types;
Sugar maple-Basswood, and Northern red oak - Basswood - White ash type;
although, it can grow fairly well in other types as well. The recorded pH of soils varies
between 5.0 and 7.5 in Minnesota, while ranging 4.5 to 6.0 in Wisconsin. American basswood
can be found at elevations as high as 3200 feet in the Adirondack Mountains of New York,
and even up to 5000 feet in the southern Appalachian region when growing in protected
valleys or adjacent lower slopes.
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Economic Uses |
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Basswood, also called whitewood, is not one of the
strongest types; however, it is a favorite among woodcarvers for its fine even texture and
straight grain. Although basswood is never used where strength is required, the soft
wood is especially popular for making food boxes, furniture, pulpwood, crating, excelsior,
and piano keys. Because of its odorless qualities, it can also be used to make food
containers or woodenware. Many carvers favor basswood over other types claiming its ideal
stability and precision working. The inner bark of basswood is characterized by its
intertwined fibers which make it tough and leathery. Not very long ago, it was those
qualities, that turned the bark into mats, nets, ropes, and even shoes.
Among other uses, basswood is well suitable for making
beehive frames, pattern making, millwork such as blinds, moldings, sashes, doors. In the
middle ages, a related species of basswood was called "a holly wood" because it
was so often used for carving religious figures. Basswood is not only practical for its
wood qualities and aesethics, it is also very often used to decorate our yards, parks, and
avenues.
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Medicinal Uses |
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American basswood is not used commonly for medical
purposes; interestingly though, for its light weight, it is sometimes used for making
artificial limbs.
Quite common and popular among those supporting herbal
medicine, the very fragrant flowers of American basswood are collected at their peak
during mid to late summer, dried, and used for making herbal tea, which has very pleasing
affects and aroma for those seeking to ease the common cold symptoms.
Basswood is also recognized as a bee-tree by many people.
As the yellowish flowers start blooming and richly producing very sweet and scentfull
nectar, the trees become alive with bees. Basswood honey has an exceptionally fine flavor
and is often recommended by those who ever tasted it as a herbal remedy.
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Origin of name |
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of common name> |
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of scientific name> |
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References |
Audubon Society. 1980. National Audubon Society Field
Guide to North American Trees. New York: Alfred A. Knoph, Inc.
Kappel-Smith, Diana. 1996. Curing the Farming Blues. Country Journal. 23(4):59-61.
Sandlin, Beverly. 1995. The Bee Tree. Countryside & Small Stock Journal. 79(2):47-49.
Harrap, George G. Glory of the Tree. New York: Doubleday & Company, 1966.
Beckett, Kenneth. The Love of Trees. London: Octopus Books Limited,
1975.
Petrides, George A. Field Guide to Eastern Trees. Boston: Houghton
Mifflin Co., 1988. |
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Other web sites of interest |
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In The Encyclopedia of Trees, Hugh Johnson quite loyally describes American
basswood :
"Of
all the biggest class of trees they are the most softly leafy, with fine-textured,
heart-shaped leaves as big as the palm of a lady's hand. And in midsummer they sweeten the
air most mellifluously with the scent of their flowers."
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This
page was written by Andrea Polasekova for Bio 141, Botany,
Fall 1998.
Biology Dept., Henry Ford Community College, Dearborn, MI |
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