View source for Tsuga ← Tsuga You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Tsuga |accepted_authority=(Endlicher) Carrière |publications={{Treatment/Publication |place=185. 1855- Hemlock, pruche [Japanese tsuga, nampan] }} |common_names=Hemlock;pruche |basionyms={{Treatment/ID/Basionym |name=Pinus sect. Tsuga |authority=Endlicher |rank=section |publication_title=Syn. Conif., |publication_place=83. 1847 }} |synonyms= |hierarchy=Pinaceae;Tsuga |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Pinaceae]]</div><div class="higher-taxon"><small>genus</small>[[Tsuga]]</div></div> |etymology=Japanese tsuga, name for native hemlocks of Japan |volume=Volume 2 |mention_page= |treatment_page= }}<!-- --><span class="statement" id="st-undefined" data-properties=""><b>Trees </b>evergreen; crown conic; leading shoot usually drooping. <b>Bark</b> gray to brown, scaly, often deeply furrowed. <b>Branches</b> horizontal, often tending to be arranged in flattened "sprays" and arched downward; short (spur) shoots absent; young twigs and distal portions of stem flexuous and pendent, roughened by peglike projections persisting after leaves fall. <b>Buds</b> mostly rounded at apex, not resinous. <b>Leaves</b> borne singly, persisting several years, ± 2-ranked or radiating in all directions, flattened to somewhat angular; abruptly narrowed to a petiolelike base, set on peglike projections, these angled, projected forward, sheath absent; apex rounded or notched; resin canals 1. <b>Cones</b> borne on year-old twigs. <b>Pollen</b> cones solitary, globose, brown. <b>Seed</b> cones maturing in 1 year, shedding seeds and falling soon thereafter or persisting for several years, pendent, ovoid, oblong, or oblong-cylindric, sessile or nearly so; scales persistent, shape various, thin, leathery, lacking apophysis and umbo; bracts small, included. <b>Seeds</b> winged; cotyledons 4–6. <b>x</b> =12.</span><!-- -->{{Treatment/Body |distribution=Northern Hemisphere. |discussion=<p>Species of <i>Tsuga</i> are found naturally in areas of relatively moist climates where water stresses are minimal. Most are conspicuous, if not dominant, members of the communities in which they occur.</p><!-- --><p>Hemlock wood is moderately strong and pliable and lacks resin ducts. With the decline of associated species considered superior in commercial value, hemlocks have become important in the timber industry, especially for pulp. Hemlocks are also widely used for horticultural purposes; numerous cultivars have been developed.</p><!-- --><p>Species ca. 10 (4 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 |Leaves mostly spreading in all directions from twigs, bearing stomates on both surfaces or on abaxial surface only; seed cones ovoid, oblong, or oblong-cylindric, 2.5-6 cm; scales oblong, 8-18 mm. |[[#key-0-2| > 2]] |-id=key-0-1 |1 |Leaves mostly appearing 2-ranked, bearing stomates on abaxial surface only; seed cones ovoid, (1-)1.5-2.5(-3) cm; scales ovate to cuneate, 8-15 mm. |[[#key-0-3| > 3]] |-id=key-0-2 |2 |Leaves bearing stomates on both surfaces, thicker along midline; seed cones 3-6 cm, half as wide; montane tree of w North America. |[[Tsuga mertensiana|Tsuga mertensiana]] |-id=key-0-2 |2 |Leaves bearing stomates on abaxial surface only, flat, not notably thicker along midline, but slightly revolute; seed cones 2.5-4 cm, more than half as wide; montane tree of se United States. |[[Tsuga caroliniana|Tsuga caroliniana]] |-id=key-0-3 |3 |Buds 2.5-3.5 mm; crown narrowly conic; tree of w North America. |[[Tsuga heterophylla|Tsuga heterophylla]] |-id=key-0-3 |3 |Buds 1.5-2.5 mm; crown broadly conic; tree of e North America. |[[Tsuga canadensis|Tsuga canadensis]] |} </div></div><!-- -->{{#Taxon: name=Tsuga |author=Ronald J. Taylor |authority=(Endlicher) Carrière |rank=genus |parent rank=family |synonyms= |basionyms=Pinus sect. Tsuga |family=Pinaceae |distribution=Northern Hemisphere. |reference=None |publication title= |publication year= |special status= |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V2/V2_647.xml |genus=Tsuga }}<!-- -->[[Category:Treatment]][[Category:Pinaceae]] Templates used on this page: Template:Pinaceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/ID/Basionym (view source) Template:Treatment/Publication (view source) Return to Tsuga.