Jepson eFlora: Taxon page
Vascular Plants of California
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Thuja plicata

Higher Taxonomy
Family: CupressaceaeView DescriptionDichotomous Key
Habit: Shrub, tree, generally evergreen; monoecious or dioecious. Leaf: simple, cauline, alternate or opposite (either +- 4-ranked) or whorled in 3s (6-ranked), linear or scale-, awl- or needle-like (sometimes linear and awl-like on 1 pl, or on juvenile or injured plants), generally decurrent, covering young stems. Pollen Cone: axillary or terminal. Seed Cone: +- fleshy to generally woody, generally hard at maturity; scales opposite or whorled, peltate or not. Seed: 1--many per scale, angled or lateral winged, generally wind-dispersed. Chromosomes: n=11.
Genera In Family: 30 genera, 130+ species: +- worldwide, especially North America, Eurasia. Note: Incl (paraphyletic) Taxodiaceae. Taxa of (polyphyletic) Cupressus in TJM (1993) now in Callitropsis, Chamaecyparis, Hesperocyparis.
eFlora Treatment Author: Jim A. Bartel, except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: ThujaView Description 

Stem: trunk generally flared at base; branches spreading to +- pendent, tips often upturned; young shoots 4-sided, in flat clusters, held horizontally. Leaf: opposite, 2-ranked, +- not appearing whorled in 4s, closely appressed, scale-like, exposed part +- as long as wide. Pollen Cone: terminal. Seed Cone: erect to reflexed, woody, ovoid-oblong, tapered to point, maturing 1st year; scales in 4--6 pairs, +- overlapping, sharp-pointed near tip, thin, oblong, acute, leathery, middle 2--3 pairs fertile. Seed: (1)2 per fertile scale, wings 2, +- equal; cotyledons 2.
Species In Genus: 5 species: northern North America, eastern Asia. Etymology: (Greek: resinous tree)
Thuja plicata D. Don
Habit: Tree 30--70 m. Stem: bark 1--2 cm thick, cinnamon-red, fibrous; young shoot upper surface glossy dark green, lower surface generally faintly white-streaked. Pollen Cone: red-brown turning dark gray. Seed Cone: 10--19 mm, light brown. Seed: 4--6 mm, narrow, elliptic, light brown. Chromosomes: n=11.
Ecology: Coastal conifer forest; Elevation: < 1800 m. Bioregional Distribution: NCo, KR, NCoRO (Del Norte, Humboldt cos.); Distribution Outside California: to Alaska, Montana.
Jepson eFlora Author: Jim A. Bartel
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Botanical illustration including Thuja plicata

botanical illustration including Thuja plicata


Citation for this treatment: Jim A. Bartel 2012, Thuja plicata, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 25, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on April 25, 2019.

No expert verified images found for Thuja plicata.

Geographic subdivisions for Thuja plicata:
NCo, KR, NCoRO (Del Norte, Humboldt cos.);
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.