Thuja L.
  • Sp. Pl. 2: 1002. 1753. (1 May 1753)
  • Arborvitae, thuya, cèdre [Greek name for some evergreen, resinous trees]


This taxon is accepted by Cupressaceae
Notes: More details could be found in The Plant List v.1.1. Originally in The Plant List v.1.0

General Information

Trees or shrubs evergreen, monoecious; branchlets arranged in a plane, flattened. Leaves 4-ranked, scalelike, base decurrent only on leading branchlets, dimorphic along branchlets: facial pairs obovate-rhombic; lateral pairs boat-shaped, ridged abaxially, less than 4 mm, overlapping facial pairs, without conspicuous, white stomatal bands abaxially. Pollen cones with (4 or)6-10(-16) microsporophylls, each with (2 or)3 or 4 pollen sacs. Seed cones terminal, solitary, dehiscent when mature in 1st year; cone scales 8 or 10, decussate, flat, only middle, larger 2 or 3 pairs fertile, each fertile scale bearing 1 or 2 seeds; free bract apex a very short mucro. Seeds flat, with 2 lateral, narrow wings. Cotyledons 2.

  • Provided by: [D].Flora Of CHina @ efloras.org
    • Source: [
    • 1
    • ]. 

    Trees evergreen, small to large. Branchlets flattened, in fan-shaped, flattened, frondlike sprays. Leaves opposite in 4 ranks. Adult leaves heteromorphic; those on larger branchlets with sharp, erect, free apices to ca. 2 mm; those on flattened lateral branchlets crowded, appressed, scalelike, lateral pairs keeled, facial pairs flat; abaxial glands present or absent. Pollen cones with 2--6 pairs of sporophylls, each sporophyll with 2--4 pollen sacs. Seed cones maturing and opening first year, ellipsoid, (6--)9--14(--18) mm; scales persistent, 4--6 pairs, overlapping, oblong and basifixed, thin and woody, 2--3 central pairs fertile, uniformly thin or with slightly enlarged apex, remaining scales sterile. Seeds 1--3 per scale, lenticular, equally 2-winged; cotyledons 2. x = 11.

  • Provided by: [B].Flora of North America @ efloras.org
    • Source: [
    • 2
    • ]. 

    "Female cones oblong-ovoid, leathery or woody, with 4–6 pairs of overlapping scales, the upper and lower scales sterile, the middle ones each with 2–3 ovules; seeds winged; microsporophylls few; monoecious trees with shreddy bark and small, appressed, imbricate, scale-like, decussately opposite lvs, the lateral ones folded, the upper and lower flat and with a prominent resin-gland, branchlets numerous from the axils of the lateral lvs, forming soft, flat sprays. 6, N. Temp."

  • Provided by: [C].New York Botanical Garden
    • Source: [
    • 3
    • ]. 

    Other Local Names

    NameLanguageCountry
    Arborvitae, thuya, cèdre [Greek name for some evergreen, resinous trees]

     Information From

    Cupressaceae
    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=1
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • D Missouri Botanical Garden
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • E CC0 1.0 Universal (CC0 1.0).