View source for Thuja

{{Treatment/ID
|accepted_name=Thuja
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 1002. 1753; Gen. Pl. ed. 5, 435, 1754
|year=1754
}}
|common_names=Arborvitae;thuya;cèdre
|basionyms=
|synonyms=
|hierarchy=Cupressaceae;Thuja
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Cupressaceae]]</div><div class="higher-taxon"><small>genus</small>[[Thuja]]</div></div>
|etymology=Greek name for some evergreen, resinous trees
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="tree duration;tree size;tree size;tree size"><b>Trees </b>evergreen, small to large.</span> <span class="statement" id="st-d0_s1" data-properties="branchlet shape;spray shape;spray shape;spray shape"><b>Branchlets </b>flattened, in fan-shaped, flattened, frondlike sprays.</span> <span class="statement" id="st-d0_s2" data-properties="leaf arrangement;rank count"><b>Leaves </b>opposite in 4 ranks.</span> <span class="statement" id="st-d0_s3" data-properties=""><b>Adult </b>leaves heteromorphic;</span> <span class="statement" id="st-d0_s4" data-properties="apex shape;apex orientation;apex fusion;apex some measurement">those on larger branchlets with sharp, erect, free apices to ca. 2 mm;</span> <span class="statement" id="st-d0_s5" data-properties="leaf life cycle;leaf architecture;leaf shape;leaf structure subtype;leaf prominence or shape;lateral branchlet shape;lateral branchlet arrangement;lateral branchlet fixation or orientation;lateral branchlet shape;lateral branchlet position">those on flattened lateral branchlets crowded, appressed, scalelike, lateral pairs keeled, facial pairs flat;</span> <span class="statement" id="st-d0_s6" data-properties="abaxial gland count;abaxial gland count">abaxial glands present or absent.</span> <span class="statement" id="st-d0_s7" data-properties="pair count;pollen-sac count"><b>Pollen </b>cones with 2–6 pairs of sporophylls, each sporophyll with 2–4 pollen-sacs.</span> <span class="statement" id="st-d0_s8" data-properties="seed-cone life cycle"><b>Seed-</b>cones maturing and opening first-year, ellipsoid, (6–) 9–14 (–18) mm;</span> <span class="statement" id="st-d0_s9" data-properties="scale duration;scale count;scale arrangement;scale shape;scale fixation;scale width;scale texture;scale count;scale position;scale reproduction;scale width;scale width;scale reproduction;apex size">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.</span> <span class="statement" id="st-d0_s10" data-properties="seed count;seed shape;seed architecture"><b>Seeds </b>1–3 per scale, lenticular, equally 2-winged;</span> <span class="statement" id="st-d0_s11" data-properties="">cotyledons 2.</span> <span class="statement" id="st-d0_s12" data-properties="cotyledon count;x chromosome count">x = 11.</span><!--

-->{{Treatment/Body
|distribution=North America;e Asia.
|discussion=<p>Two Asiatic species, Thuja koraiensis Nakai (Korean arborvitae) and T. standishii (Gordon) Carrière (Japanese arborvitae), are occasional in cultivation. They differ from the native species in having more closely spaced long-shoot leaves with shorter, spreading points.</p><!--
--><p>Species 5 (2 in the flora).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Foliage dull yellowish green abaxially and adaxially; seed-cone scales minutely mucronate; e United States and e Canada.
|[[Thuja occidentalis|Thuja occidentalis]]
|-id=key-0-1
|1
|Foliage white-striped abaxially when fresh, glossy green adaxially; seed-cone scales with evident, nearly terminal, deltate projection; w United States and w Canada.
|[[Thuja plicata|Thuja plicata]]
|}
</div></div><!--

-->{{#Taxon:
name=Thuja
|author=Kenton L. Chambers
|authority=Linnaeus
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Cupressaceae
|distribution=North America;e Asia.
|reference=None
|publication title=Sp. Pl.
|publication year=1754
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V2/V2_793.xml
|genus=Thuja
|abaxial gland count=absent;present
|apex fusion=free
|apex orientation=erect
|apex shape=sharp
|apex size=enlarged
|apex some measurement=0mm;2mm
|branchlet shape=flattened
|cotyledon count=2
|lateral branchlet arrangement=crowded
|lateral branchlet fixation or orientation=appressed
|lateral branchlet position=lateral
|lateral branchlet shape=scalelike;flattened
|leaf architecture=heteromorphic
|leaf arrangement=opposite
|leaf life cycle=adult
|leaf prominence or shape=flat
|leaf shape=keeled
|leaf structure subtype=facial
|pair count=2;6
|pollen-sac count=2;4
|rank count=4
|scale arrangement=overlapping
|scale count=2;3
|scale duration=persistent
|scale fixation=basifixed
|scale position=central
|scale reproduction=sterile;fertile
|scale shape=oblong
|scale texture=woody
|scale width=with slightly enlarged apex;thin;thin
|seed architecture=2-winged
|seed count=1;3
|seed shape=lenticular
|seed-cone life cycle=maturing
|spray shape=frondlike;flattened;fan-shaped
|tree duration=evergreen
|tree size=small;large
|x chromosome count=11
}}<!--

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