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| The foliage of thuja is rich in ] and is believed to be the ] which cured the ] of ] and his party in the winter of 1535–1536.<ref>{{cite web | url = http://www.na.fs.fed.us/Spfo/pubs/silvics_manual/Volume_1/thuja/occidentalis.htm | title = Thuja occidentalis L.: Northern White-Cedar | work = Silvics of North America (Agriculture Handbook 654) | author = Russell M. Burns and Barbara H. Honkala (Technical Coordinators) | date = December 1990 }} </ref> Due to the neurotoxic compound ], internal use can be harmful and is not recommended. | The foliage of thuja is rich in ] and is believed to be the ] which cured the ] of ] and his party in the winter of 1535–1536.<ref>{{cite web | url = http://www.na.fs.fed.us/Spfo/pubs/silvics_manual/Volume_1/thuja/occidentalis.htm | title = Thuja occidentalis L.: Northern White-Cedar | work = Silvics of North America (Agriculture Handbook 654) | author = Russell M. Burns and Barbara H. Honkala (Technical Coordinators) | date = December 1990 }} </ref> Due to the neurotoxic compound ], internal use can be harmful and is not recommended. | ||
| Thuja occidentalis extracts have been used as an ingredient of herbal remedies, and for ] preparations.<ref name="van Wyk & Wink 2004">van Wyk, B.-E. & Wink, M. 2004. ''Medicinal Plants of the World.'' Portland, Oregon: Timber Press.</ref> | |||
| White cedar is the preferred wood for the structural elements, such as ribs and planking, of birchbark ]s and the planking of wooden ]s. | White cedar is the preferred wood for the structural elements, such as ribs and planking, of birchbark ]s and the planking of wooden ]s. | ||
Revision as of 02:23, 15 February 2008
| Thuja occidentalis | |
|---|---|
| |
| Thuja occidentalis foliage and cones | |
| Conservation status | |
 Least Concern | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Pinales |
| Family: | Cupressaceae |
| Genus: | Thuja |
| Species: | T. occidentalis |
| Binomial name | |
| Thuja occidentalis L. | |
Thuja occidentalis is an evergreen coniferous tree, in the cypress family Cupressaceae, which is widely cultivated for use as an ornamental plant. The endemic occurence of this species is a north-eastern distribution in North America. It is thought to be the first tree of that region to be cultivated in Europe.
Description
An evergreen tree with fan-like branches and scaly leaves. Unlike the closely related species, Thuja plicata (Western Redcedar), it is only a small tree. Growing to a height of 10-20 m tall with a 0.4 m trunk diameter, exceptionally to 30 m tall and 1.6 m diameter, the tree is often stunted or prostrate. The bark is red-brown, furrowed and peels in narrow, longitudinal strips. The foliage forms in flat sprays with scale-like leaves 3-5 mm long. The cones are slender, yellow-green ripening brown, 10-15 mm long and 4-5 mm broad, with 6-8 overlapping scales. The branches may take root if the tree falls.
Distribution
Native to the northeastern U.S. and southeastern Canada, from central Saskatchewan east to New Brunswick, and south to eastern Tennessee in the Appalachian Mountains.
Naming and taxonomy
The species was first described by Carolus Linnaeus, in 1753, the name remains current. Common names include Eastern Arborvitae, American Arborvitae, Techny Arborvitae, or just Arborvitae, the last particularly in the horticultural trade. Other names by which it is known include Northern Whitecedar, Eastern Whitecedar or White Cedar (although it is not a true cedar), and Swamp Cedar. Thuja occidentalis should not be confused with the Melia azedarach, an Australian deciduous tree sometimes also known as White Cedar. A large number of names for cultivars are used by horticulturalists.
Ecology
Thuja occidentalis grows naturally in wet forests, being particularly abundant in swamps where other larger and faster-growing trees cannot compete successfully. It also occurs on other sites with reduced tree competition such as cliffs. Although not currently listed as endangered, wild Thuja occidentalis populations are threatened in many areas by the very high deer numbers encouraged by hunting associations; deer find the soft evergreen foliage a very attractive winter food, and strip it rapidly. The largest known is 34 m tall and 175 cm diameter, in South Manitou Island within Leelanau County, Michigan. It can be a very long-lived tree in certain conditions, with notably old specimens growing on cliffs where they are inaccessible to deer and wildfire; the oldest known living specimen is just over 1,000 years old, but a dead specimen with over 1,500 growth rings has been found. These very old trees are, despite their age, small and stunted due to the difficult growing conditions.
Uses
Thuja occidentalis is very widely used as an ornamental tree, particularly for screens and hedges. Over 300 cultivars have been selected and named for garden use; some of the commoner in the horticultural trade include 'Degroot's Spire', 'Ellwangeriana', 'Hetz Wintergreen', 'Lutea', 'Rheingold', 'Smaragd' (a.k.a. 'Emerald Green'), 'Techny', and 'Wareana'. It was introduced into Europe as early as 1540 and today is widely cultivated there, especially in parks and cemeteries.
The foliage of thuja is rich in Vitamin C and is believed to be the annedda which cured the scurvy of Jacques Cartier and his party in the winter of 1535–1536. Due to the neurotoxic compound thujone, internal use can be harmful and is not recommended.
White cedar is the preferred wood for the structural elements, such as ribs and planking, of birchbark canoes and the planking of wooden canoes.
References
- "Thuja occidentalis Linnaeus 1753". conifers.org. Gymnosperm Database.
- Russell M. Burns and Barbara H. Honkala (Technical Coordinators) (December 1990). "Thuja occidentalis L.: Northern White-Cedar". Silvics of North America (Agriculture Handbook 654).
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Leaves on an Eastern Arborvitae
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Trunk
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Botanical illustration from a 1913 Flora
