Difference between revisions of "Pseudotsuga"

Carrière

Traité Gén. Conif., ed. 2 256. 1867.

Etymology: Greek pseudo, false, and tsuga, hemlock
Treatment appears in FNA Volume 2.
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--><span class="statement" id="st-d0_s0" data-properties="tree shape;tree duration"><b>Trees </b>conic, evergreen.</span> <span class="statement" id="st-d0_s1" data-properties=""><b>Bark </b>initially smooth, with resin blisters;</span> <span class="statement" id="st-d0_s2" data-properties="bark architecture or pubescence or relief;bark coloration;bark pubescence or texture;bark architecture">in age reddish-brown, corky, furrowed.</span> <span class="statement" id="st-d0_s3" data-properties="branch orientation;branch arrangement"><b>Branches </b>often pendulous, irregularly whorled;</span> <span class="statement" id="st-d0_s4" data-properties="shoot height or length or size;shoot count">short (spur) shoots absent;</span> <span class="statement" id="st-d0_s5" data-properties="leaf-scar arrangement or shape;leaf-scar prominence;leaf-scar prominence">leaf-scars transversely elliptic, slightly raised proximally but essentially flush with twig distally.</span> <span class="statement" id="st-d0_s6" data-properties="bud shape;bud coating;apex shape"><b>Buds </b>elongate, not resinous, apex acute.</span> <span class="statement" id="st-d0_s7" data-properties="leaf arrangement;leaf duration;leaf count;leaf arrangement;leaf architecture;leaf shape"><b>Leaves </b>borne singly, persisting 6–8 years, alternate, short-stalked, flattened;</span> <span class="statement" id="st-d0_s8" data-properties="resin canal count;resin canal position">resin canals 2, marginal.</span> <span class="statement" id="st-d0_s9" data-properties="twig life cycle"><b>Cones </b>borne on year-old twigs.</span> <span class="statement" id="st-d0_s10" data-properties="pollen cone position"><b>Pollen </b>cones axillary.</span> <span class="statement" id="st-d0_s11" data-properties="seed-cone life cycle;apophysis orientation;apophysis orientation;apophysis shape;apophysis shape;apophysis shape;apophysis architecture;apophysis count"><b>Seed-</b>cones maturing first season, shed whole, deflexed or pendent, ellipsoid, ovoid, or cylindric, nearly sessile, lacking apophysis and umbo;</span> <span class="statement" id="st-d0_s12" data-properties="scale duration;apex shape">scales persistent, apex rounded;</span> <span class="statement" id="st-d0_s13" data-properties="bract position;apex shape;apex shape;central lobe size or width;central lobe length or size">bracts ± exserted, apex 3-lobed, lobes with acute apices, central lobe narrow, longer than lateral lobes.</span> <span class="statement" id="st-d0_s14" data-properties="seed architecture"><b>Seeds </b>winged;</span> <span class="statement" id="st-d0_s15" data-properties="">cotyledons 6–12.</span> <span class="statement" id="st-d0_s16" data-properties="cotyledon count;x chromosome count;x chromosome count">x =12, 13.</span><!--
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--><span class="statement" id="st-undefined" data-properties=""><b>Trees </b>conic, evergreen. <b>Bark</b> initially smooth, with resin blisters; in age reddish brown, corky, furrowed. <b>Branches</b> often pendulous, irregularly whorled; short (spur) shoots absent; leaf scars transversely elliptic, slightly raised proximally but essentially flush with twig distally. <b>Buds</b> elongate, not resinous, apex acute. <b>Leaves</b> borne singly, persisting 6–8 years, alternate, short-stalked, flattened; resin canals 2, marginal. <b>Cones</b> borne on year-old twigs. <b>Pollen</b> cones axillary. <b>Seed</b> cones maturing first season, shed whole, deflexed or pendent, ellipsoid, ovoid, or cylindric, nearly sessile, lacking apophysis and umbo; scales persistent, apex rounded; bracts ± exserted, apex 3-lobed, lobes with acute apices, central lobe narrow, longer than lateral lobes. <b>Seeds</b> winged; cotyledons 6–12. <b>x</b> =12, 13.</span><!--
  
 
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|publication year=1867
 
|publication year=1867
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V2/V2_621.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V2/V2_621.xml
 
|genus=Pseudotsuga
 
|genus=Pseudotsuga
|apex shape=acute;3-lobed;rounded;acute
 
|apophysis architecture=sessile
 
|apophysis count=lacking
 
|apophysis orientation=pendent;deflexed
 
|apophysis shape=cylindric;ovoid;ellipsoid
 
|bark architecture=furrowed
 
|bark architecture or pubescence or relief=smooth
 
|bark coloration=reddish-brown
 
|bark pubescence or texture=corky
 
|bract position=exserted
 
|branch arrangement=whorled
 
|branch orientation=pendulous
 
|bud coating=not resinous
 
|bud shape=elongate
 
|central lobe length or size=longer
 
|central lobe size or width=narrow
 
|cotyledon count=6;12
 
|leaf architecture=short-stalked
 
|leaf arrangement=alternate;singly
 
|leaf count=6;8
 
|leaf duration=persisting
 
|leaf shape=flattened
 
|leaf-scar arrangement or shape=elliptic
 
|leaf-scar prominence=flush;raised
 
|pollen cone position=axillary
 
|resin canal count=2
 
|resin canal position=marginal
 
|scale duration=persistent
 
|seed architecture=winged
 
|seed-cone life cycle=maturing
 
|shoot count=absent
 
|shoot height or length or size=short
 
|tree duration=evergreen
 
|tree shape=conic
 
|twig life cycle=year-old
 
|x chromosome count=13;12
 
 
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Revision as of 13:24, 27 July 2019

Trees conic, evergreen. Bark initially smooth, with resin blisters; in age reddish brown, corky, furrowed. Branches often pendulous, irregularly whorled; short (spur) shoots absent; leaf scars transversely elliptic, slightly raised proximally but essentially flush with twig distally. Buds elongate, not resinous, apex acute. Leaves borne singly, persisting 6–8 years, alternate, short-stalked, flattened; resin canals 2, marginal. Cones borne on year-old twigs. Pollen cones axillary. Seed cones maturing first season, shed whole, deflexed or pendent, ellipsoid, ovoid, or cylindric, nearly sessile, lacking apophysis and umbo; scales persistent, apex rounded; bracts ± exserted, apex 3-lobed, lobes with acute apices, central lobe narrow, longer than lateral lobes. Seeds winged; cotyledons 6–12. x =12, 13.

Distribution

North America, 3 in e Asia.

Discussion

Species 5 (2 in the flora).

Key

1 Leaf apex mucronulate; seed cones 9-20 cm; sw California. Pseudotsuga macrocarpa
1 Leaf apex obtuse to acute; seed cones 4-10 cm; widely distributed in w North America. Pseudotsuga menziesii