Thuja occidentalis


Sp. Pl. 2: 1002. 1753

Common names: Northern white-cedar thuier cèdre cèdre-thuya occidental
Treatment appears in FNA Volume 2.
Trees to 15(–38) m, stunted or prostrate in harsh environments; trunk to 0.9(–1.8) m diam., sometimes divided into 2–3 secondary stems, often reproducing by layering or forming erect, rooted branches from fallen trunks; crown conical. Bark reddish brown or grayish brown, 6–9 mm thick, fibrous, fissured. Leaves of branchlets (1.5–)3–5 mm, acute, dull yellowish green on both surfaces of branchlets. Pollen cones 1–2 mm, reddish. Seed cones ellipsoid, (6–)9–14 mm, brown; fertile scales usually 2 pairs, each minutely mucronate. Seeds ca. 8 per cone, 4–7 mm (including wings), reddish brown. 2n = 22.

Habitat: On mostly calcareous substrates, neutral to basic swamps, shores of lakes and rivers, uplands, cliffs, and talus
Elevation: 0–900 m


V2 342-distribution-map.gif

Man., N.B., N.S., Ont., P.E.I., Que., Conn., Ill., Ind., Ky., Maine, Md., Mass., Mich., Minn., N.H., N.Y., N.C., Ohio, Pa., Tenn., Vt., Va., W.Va., Wis.


Isolated stands of Thuja occidentalis occur north and east of its general range in Canada (to 51° 31' N latitude in Ontario, 50° N in Quebec). In the United States south of the Great Lakes and in southern New England, it occurs locally in scattered stands and is rare or extirpated at numerous former sites. In some areas, heavy winter browsing by deer greatly reduces reproductive success through elimination of seedlings or saplings.

Thuja occidentalis is widely utilized in ornamental silviculture and has more than 120 named cultivars. It was probably the first North American tree introduced into Europe (ca. 1566). It is an important timber tree; the wood is used for applications requiring decay resistance.

Selected References


Lower Taxa


Facts about "Thuja occidentalis"
AuthorKenton L. Chambers +
AuthorityLinnaeus +
Common nameNorthern white-cedar +, thuier cèdre + and cèdre-thuya occidental +
DistributionMan. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Ill. +, Ind. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.Y. +, N.C. +, Ohio +, Pa. +, Tenn. +, Vt. +, Va. +, W.Va. + and Wis. +
Elevation0–900 m +
HabitatOn mostly calcareous substrates, neutral to basic swamps, shores of lakes and rivers, uplands, cliffs, and talus +
IllustrationPresent +
Illustration copyrightFlora of North America Association +
IllustratorJohn Myers +
Publication titleSp. Pl. +
Publication year1753 +
ReferenceNone +
Source xml grained fna xml/V2/V2 342.xml +
Taxon familyCupressaceae +
Taxon nameThuja occidentalis +
Taxon parentThuja +
Taxon rankspecies +
VolumeVolume 2 +