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<span id="openzim-page-title" class="mw-page-title-main"><i>Populus <span style="font-style:normal;">sect.</span> Populus</i></span>
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<th colspan="2" style="color:inherit; text-align: center; background-color: rgb(180,250,180)"><i>Populus <span style="font-style:normal;">sect.</span> Populus</i>
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<td colspan="2" style="text-align: center; font-size: 88%">Leaves of <i><a href="Populus_alba" title="Populus alba">Populus alba</a></i>, the type species of the section
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<th colspan="2" style="color:inherit; min-width:15em; text-align: center; background-color: rgb(180,250,180)"><a href="Taxonomy_(biology)" title="Taxonomy (biology)">Scientific classification</a> <span class=" taxobox-edit-taxonomy skin-invert" style="font-size:smaller; float:right; padding-right:0.4em; margin-left:-3em;"><span typeof="mw:File"></span></span>
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<td>Kingdom:
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<td><a href="Plant" title="Plant">Plantae</a>
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<td><i>Clade</i>:
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<td><a href="Vascular_plant" title="Vascular plant">Tracheophytes</a>
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<td><i>Clade</i>:
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<td><a href="Flowering_plant" title="Flowering plant">Angiosperms</a>
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<td><i>Clade</i>:
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<td><a href="Eudicots" title="Eudicots">Eudicots</a>
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<td><i>Clade</i>:
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<td><a href="Rosids" title="Rosids">Rosids</a>
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<td>Order:
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<td><a href="Malpighiales" title="Malpighiales">Malpighiales</a>
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<td>Family:
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<td><a href="Salicaceae" title="Salicaceae">Salicaceae</a>
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<td>Genus:
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<td><a href="Populus" title="Populus"><i>Populus</i></a>
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<td>Section:
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<th colspan="2" style="color:inherit; text-align: center; background-color: rgb(180,250,180)">Species
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<p>See <a href="#Species">text</a>
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<th colspan="2" style="color:inherit; text-align: center; background-color: rgb(180,250,180)"><a href="Synonym_(taxonomy)" title="Synonym (taxonomy)">Synonyms</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
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<td colspan="2" style="text-align: left">
<ul><li><i>P.</i> sect. <i>Leuce</i> <a href="Jean_%C3%89tienne_Duby" title="Jean Étienne Duby">Duby</a></li></ul>
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<p><b><i>Populus</i> <a href="Section_(botany)" title="Section (botany)">section</a> <i>Populus</i></b>, of the <i><a href="Populus" title="Populus">Populus</a></i> (poplar) <a href="Genus" title="Genus">genus</a>, includes the <a href="Aspen" title="Aspen">aspen trees</a> and the white poplar <i><a href="Populus_alba" title="Populus alba">Populus alba</a></i>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The five typical aspens are all native to cold regions with cool summers, in the north of the <a href="Northern_Hemisphere" title="Northern Hemisphere">Northern Hemisphere</a>, extending south at high altitudes in the mountains. The white poplar, by contrast, is native to warmer regions, with hot, dry summers. These trees are all medium-sized <a href="Deciduous" title="Deciduous">deciduous</a> trees ranging 15–30 metres (49–98 ft) tall.
</p><p>All of the species in section <i>Populus</i> typically grow in large <a href="Clonal_colony" title="Clonal colony">clonal colonies</a> derived from a single seedling, and spreading by means of <a href="Basal_shoot" title="Basal shoot">root suckers</a>; new stems in the colony may appear at up to 30–40 metres from the previous trees. Each individual tree can live for 40–150 years above ground, but the <a href="Root" title="Root">root</a> system of the colony is long-lived, sending up new trunks as the older trunks die off above ground, spreading about a metre per year, sometimes eventually covering many hectares. They are able to survive <a href="Wildfire" title="Wildfire">forest fires</a> because the roots are below the heat of the fire, and new sprouts can grow from the roots. One colony of American aspen (<i>P. tremuloides</i>) in Utah, given the nickname of <a href="Pando_(Quaking_Aspen)" class="mw-redirect" title="Pando (Quaking Aspen)">"Pando"</a>, has been estimated to be 80,000 years old (disputed), making it possibly the <a href="List_of_long-living_organisms" class="mw-redirect" title="List of long-living organisms">oldest living colony</a> of aspens.
</p>
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<div class="mw-heading mw-heading2"><h2 id="Species">Species</h2></div>
<p>Some of the species in the section are:<sup id="cite_ref-FOC_3-0" class="reference"><a href="#cite_note-FOC-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</p>
<ul><li><i><a href="Populus_adenopoda" title="Populus adenopoda">Populus adenopoda</a></i> – Chinese aspen<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> (China, south of <i>P. tremula</i>)</li>
<li><i><a href="Populus_alba" title="Populus alba">Populus alba</a></i> – white poplar (northwest Africa, southern Europe, east to central Asia)</li>
<li><i>Populus davidiana</i> – Korean aspen<sup id="cite_ref-:0_5-0" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> (Korea)</li>
<li><i><a href="Populus_grandidentata" title="Populus grandidentata">Populus grandidentata</a></i> – bigtooth aspen (eastern North America, south of <i>P. tremuloides</i>)</li>
<li><i><a href="Populus_koreana" class="mw-redirect" title="Populus koreana">Populus koreana</a></i> – Korean poplar<sup id="cite_ref-:0_5-1" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> (Korea)</li>
<li><i>Populus ningshanica</i></li>
<li><i>Populus qiongdaoensis</i></li>
<li><i>Populus rotundifolia</i></li>
<li><i>Populus sieboldii</i> – Japanese aspen<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> (Japan)</li>
<li><i><a href="Populus_simonii" title="Populus simonii">Populus simonii</a></i> – Simon's poplar<sup id="cite_ref-:0_5-2" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> (Korea)</li>
<li><i><a href="Populus_suaveolens" title="Populus suaveolens">Populus suaveolens</a></i> – Manchurian poplar<sup id="cite_ref-:0_5-3" class="reference"><a href="#cite_note-:0-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> (Korea)</li>
<li><i><a href="Populus_tomentosa" class="mw-redirect" title="Populus tomentosa">Populus tomentosa</a></i>, Chinese white poplar<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> (China)</li>
<li><i><a href="Populus_tremula" title="Populus tremula">Populus tremula</a></i> – Eurasian aspen (northern Europe and Asia)</li>
<li><i><a href="Populus_tremuloides" title="Populus tremuloides">Populus tremuloides</a></i> – American aspen (northern and western North America)</li>
<li><i>Populus wulianensis</i></li></ul>
<p>Natural hybrids between species in the section include:
</p>
<ul><li><i>Populus</i> × <i>canescens</i>: grey poplar,<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> <i>P. alba</i> × <i>P. tremula</i></li>
<li><i>Populus</i> × <i>hopeiensis</i>: <i>P. davidiana</i> × <i>P. tomentosa</i></li>
<li><i>Populus</i> × <i>pseudotomentosa</i>: <i>P. adenopoda</i> × <i>P. tomentosa</i></li></ul>
<div class="mw-heading mw-heading2"><h2 id="Ecology">Ecology</h2></div>
<p>Aspens do not thrive very well in the shade, and it is difficult for aspen seedlings to grow in an already mature aspen stand. Fire indirectly benefits aspen trees, since it allows the saplings to flourish in open sunlight in the burned landscape. Lately, aspens have an increased popularity in forestry, mostly because of their fast growth rate and ability to regenerate from sprouts, making the <a href="Reforestation" title="Reforestation">reforestation</a> after harvesting much cheaper, since no planting or <a href="Sowing" title="Sowing">sowing</a> is required.
</p><p>In contrast with many trees, aspen <a href="Bark_(botany)" title="Bark (botany)">bark</a> is base-rich, meaning that aspens are important hosts for <a href="Bryophytes" class="mw-redirect" title="Bryophytes">bryophytes</a><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> and act as food plants for the <a href="Larvae" class="mw-redirect" title="Larvae">larvae</a> of butterfly (<a href="Lepidoptera" title="Lepidoptera">Lepidoptera</a>) species—see List of Lepidoptera that feed on poplars.
</p><p>Young aspen bark is an important seasonal forage for the <a href="European_hare" title="European hare">european hare</a> and other animals in early spring. Aspen is also a tree of choice of the <a href="European_beaver" class="mw-redirect" title="European beaver">european beaver</a>.
</p>
<div class="mw-heading mw-heading2"><h2 id="Uses">Uses</h2></div>
<p>Aspen <a href="Wood" title="Wood">wood</a> is white and soft, but fairly strong, and has low flammability. It has a number of uses, notably for making <a href="Match" title="Match">matches</a> and <a href="Paper" title="Paper">paper</a> where its low flammability makes it safer to use than most other woods. Shredded aspen wood is used for packing and stuffing, sometimes called <a href="Excelsior_(wood_wool)" class="mw-redirect" title="Excelsior (wood wool)">excelsior (wood wool)</a>. It is also a popular animal bedding, since it lacks the <a href="Phenol" title="Phenol">phenols</a> associated with <a href="Pine" title="Pine">pine</a> and <a href="Juniper" title="Juniper">juniper</a>, which are thought to cause <a href="Respiratory_system" title="Respiratory system">respiratory system</a> ailments in some animals. Heat-treated aspen is a popular material for the interiors of a <a href="Sauna" title="Sauna">sauna</a>. While standing trees sometimes tend to rot from the heart outward, the dry timber weathers very well, becoming silvery-grey and resistant to rotting and warping, and has traditionally been used for rural construction in the northwestern regions of Russia (especially for roofing, in the form of thin slats).
</p><p>The <a href="Ojibwe" title="Ojibwe">Ojibwe</a> used the inner bark of the trunk as a <a href="Poultice" title="Poultice">poultice</a>, and the <a href="Cree" title="Cree">Cree</a> ate the inner bark in the spring as a mild purgative.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><cite class="citation cs1"><a rel="nofollow" class="external text" href="https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=29421">"<i>Populus tomentosa</i>"</a>. <i><a href="Germplasm_Resources_Information_Network" title="Germplasm Resources Information Network">Germplasm Resources Information Network</a></i>. <a href="Agricultural_Research_Service" title="Agricultural Research Service">Agricultural Research Service</a>, <a href="United_States_Department_of_Agriculture" title="United States Department of Agriculture">United States Department of Agriculture</a><span class="reference-accessdate">. Retrieved <span class="nowrap">21 January</span> 2018</span>.</cite></span>
</li>
<li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><cite class="citation cs1"><a rel="nofollow" class="external text" href="https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=29379">"<i>Populus</i> × <i>canescens</i>"</a>. <i><a href="Germplasm_Resources_Information_Network" title="Germplasm Resources Information Network">Germplasm Resources Information Network</a></i>. <a href="Agricultural_Research_Service" title="Agricultural Research Service">Agricultural Research Service</a>, <a href="United_States_Department_of_Agriculture" title="United States Department of Agriculture">United States Department of Agriculture</a><span class="reference-accessdate">. Retrieved <span class="nowrap">21 January</span> 2018</span>.</cite></span>
</li>
<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.cairngorms.co.uk/resource/docs/publications/05042007/CNPA.Paper.440.Aspen%20Report.txt">The Biodiversity and Management of Aspen woodlands: Proceedings of a one-day conference held in Kingussie, Scotland, on 25th May 2001</a></span>
</li>
<li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text">Native American ethnobotany, pp. 427–433, Daniel E. Moerman 1998.</span>
</li>
</ol></div></div>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20050305112933/http://www.treesforlife.org.uk/tfl.aspen_info_resource.html">Aspen Information Resource, U.K.</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120126102319/http://www.cpluhna.nau.edu/Biota/aspen_forest.htm">Quaking Aspen Forests of the Colorado Plateau</a></li>
<li><a rel="nofollow" class="external text" href="http://www.cas.vanderbilt.edu/bioimages/species/pogr4.htm">Bioimages: Populus grandidentata</a> bigtooth aspen</li>
<li><a rel="nofollow" class="external text" href="http://digitalcommons.usu.edu/aspen_bib/">Aspen Research Bibliography</a></li></ul>
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</style></div><div role="navigation" class="navbox" aria-labelledby="Taxon_identifiers899" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Taxon_identifiers899" style="font-size:114%;margin:0 4em">Taxon identifiers</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%;text-align: left;"><i>Populus <span style="font-style:normal;">sect.</span> Populus</i></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><span style="white-space:nowrap;"><a href="Wikidata" title="Wikidata">Wikidata</a>: <span class="uid"><span class="external"><a href="https://www.wikidata.org/wiki/Q7229840" class="extiw external" title="wikidata:Q7229840">Q7229840</a></span></span></span></li>
<li><span style="white-space:nowrap;"><a href="Wikispecies" title="Wikispecies">Wikispecies</a>: <span class="uid"><span class="external"><a href="https://species.wikimedia.org/wiki/Populus_sect._Populus" class="extiw external" title="wikispecies:Populus sect. Populus">Populus sect. Populus</a></span></span></span></li>
<li><span style="white-space:nowrap;"><a href="Flora_of_China_(series)" title="Flora of China (series)">FoC</a>: <span class="uid"><a rel="nofollow" class="external text" href="http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=300251">300251</a></span></span></li>
<li><span style="white-space:nowrap;"><a href="Tropicos" title="Tropicos">Tropicos</a>: <span class="uid"><a rel="nofollow" class="external text" href="https://www.tropicos.org/name/28301378">28301378</a></span></span></li>
<li><span style="white-space:nowrap;">VASCAN: <span class="uid"><a rel="nofollow" class="external text" href="https://data.canadensys.net/vascan/taxon/2290">2290</a></span></span></li></ul>
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