familyBetulaceae
subfamilyBetulaceae subfam. Betuloideae
genusBetula
speciesBetula pubescens
subspeciesBetula pubescens subsp. pubescens
Difference between revisions of "Betula pubescens subsp. pubescens"
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|accepted_name=Betula pubescens subsp. pubescens | |accepted_name=Betula pubescens subsp. pubescens | ||
| − | |accepted_authority= | + | |accepted_authority= |
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|common_names=European white birch;downy birch | |common_names=European white birch;downy birch | ||
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Trees,</b> narrow, to 20 m; trunk usually 1, branches ascending or spreading. <b>Twigs</b> usually without conspicuous resinous glands. <b>Leaf</b> blade broadly ovate to rhomic-ovate, 3–4(–6) × 2–4(–6) cm, base rounded, truncate, or cuneate, margins finely to coarsely toothed or dentate, apex acute; surfaces abaxially moderately pubescent to velutinous, especially along major veins and in vein axils. <b>Fruiting</b> catkins 2–3 × 0.8–1.2 cm; scales puberulent and ciliate, lobes diverging at middle, central lobes ovate to delatate, apex acute to obtuse, lateral lobes divergent, about equal in length, several times broader. <b>Samaras</b> with wings somewhat broader than body, broadest near summit, extended beyond body apically. <b>2n</b> = 56.</span><!-- |
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|habitat=Rocky slopes, scrubs, heaths, and open woods where native, elsewhere in abandoned plantings, moist open roadsides, swales, swampy thickets | |habitat=Rocky slopes, scrubs, heaths, and open woods where native, elsewhere in abandoned plantings, moist open roadsides, swales, swampy thickets | ||
|elevation=0–200 m | |elevation=0–200 m | ||
| − | |distribution=B.C.;Conn.;Ind.;Maine;Mass.;N.H.;Ohio;Pa.;Vt.;native to Europe | + | |distribution=B.C.;Conn.;Ind.;Maine;Mass.;N.H.;Ohio;Pa.;Vt.;native to Europe. |
| − | |discussion=<p>Betula pubescens subsp. pubescens is commonly cultivated in northeastern North America, where it has sometimes escaped and persisted, or become adventive but not widely naturalized. It is distinguished from other light-barked species in the East by its relatively small leaves, pubescent twigs, and brownish, mostly unpeeling bark.</p> | + | |introduced=true |
| + | |discussion=<p><i>Betula pubescens </i>subsp.<i> pubescens</i> is commonly cultivated in northeastern North America, where it has sometimes escaped and persisted, or become adventive but not widely naturalized. It is distinguished from other light-barked species in the East by its relatively small leaves, pubescent twigs, and brownish, mostly unpeeling bark.</p> | ||
|tables= | |tables= | ||
|references= | |references= | ||
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name=Betula pubescens subsp. pubescens | name=Betula pubescens subsp. pubescens | ||
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|rank=subspecies | |rank=subspecies | ||
|parent rank=species | |parent rank=species | ||
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|habitat=Rocky slopes, scrubs, heaths, and open woods where native, elsewhere in abandoned plantings, moist open roadsides, swales, swampy thickets | |habitat=Rocky slopes, scrubs, heaths, and open woods where native, elsewhere in abandoned plantings, moist open roadsides, swales, swampy thickets | ||
|elevation=0–200 m | |elevation=0–200 m | ||
| − | |distribution=B.C.;Conn.;Ind.;Maine;Mass.;N.H.;Ohio;Pa.;Vt.;native to Europe | + | |distribution=B.C.;Conn.;Ind.;Maine;Mass.;N.H.;Ohio;Pa.;Vt.;native to Europe. |
|introduced=true | |introduced=true | ||
|reference=None | |reference=None | ||
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|publication year= | |publication year= | ||
|special status=Introduced | |special status=Introduced | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V3/V3_327.xml |
|subfamily=Betulaceae subfam. Betuloideae | |subfamily=Betulaceae subfam. Betuloideae | ||
|genus=Betula | |genus=Betula | ||
|species=Betula pubescens | |species=Betula pubescens | ||
|subspecies=Betula pubescens subsp. pubescens | |subspecies=Betula pubescens subsp. pubescens | ||
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-->[[Category:Treatment]][[Category:Betula pubescens]] | -->[[Category:Treatment]][[Category:Betula pubescens]] | ||
Latest revision as of 22:47, 5 November 2020
Trees, narrow, to 20 m; trunk usually 1, branches ascending or spreading. Twigs usually without conspicuous resinous glands. Leaf blade broadly ovate to rhomic-ovate, 3–4(–6) × 2–4(–6) cm, base rounded, truncate, or cuneate, margins finely to coarsely toothed or dentate, apex acute; surfaces abaxially moderately pubescent to velutinous, especially along major veins and in vein axils. Fruiting catkins 2–3 × 0.8–1.2 cm; scales puberulent and ciliate, lobes diverging at middle, central lobes ovate to delatate, apex acute to obtuse, lateral lobes divergent, about equal in length, several times broader. Samaras with wings somewhat broader than body, broadest near summit, extended beyond body apically. 2n = 56.
Phenology: Flowering late spring.
Habitat: Rocky slopes, scrubs, heaths, and open woods where native, elsewhere in abandoned plantings, moist open roadsides, swales, swampy thickets
Elevation: 0–200 m
Distribution
Introduced; B.C., Conn., Ind., Maine, Mass., N.H., Ohio, Pa., Vt., native to Europe.
Discussion
Betula pubescens subsp. pubescens is commonly cultivated in northeastern North America, where it has sometimes escaped and persisted, or become adventive but not widely naturalized. It is distinguished from other light-barked species in the East by its relatively small leaves, pubescent twigs, and brownish, mostly unpeeling bark.
Selected References
None.
Lower Taxa
None.