View source for Alnus alnobetula

{{Treatment/ID
|accepted_name=Alnus alnobetula
|accepted_authority=(Ehrhart) K. Koch
|publications={{Treatment/Publication
|title=Dendrologie
|place=2(1): 625.  1872
|year=1872
}}
|basionyms={{Treatment/ID/Basionym
|name=Betula alnobetula
|authority=Ehrhart
|rank=species
|publication_title=Gartenkalender
|publication_place=2: 193.  1783
}}
|synonyms={{Treatment/ID/Synonym
|name=Alnus ovata
|authority=(Schrank) Loddiges
|rank=species
}} {{Treatment/ID/Synonym
|name=Alnus viridis
|authority=(Chaix) de Candolle
|rank=species
}}
|hierarchy=Betulaceae;Betulaceae subfam. Betuloideae;Alnus;Alnus alnobetula
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Betulaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Betulaceae subfam. Betuloideae]]</div><div class="higher-taxon"><small>genus</small>[[Alnus]]</div><div class="higher-taxon"><small>species</small>[[Alnus alnobetula]]</div></div>
|volume=Volume 3
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> spreading to compact, to 10 m. <b>Bark</b> smooth; lenticels scattered, conspicuous to inconspicuous, small, mostly unenlarged. <b>Winter</b> buds nearly sessile, ovoid, apex acuminate; stalks usually not over 1 mm; scales 4–6, unequal, imbricate. <b>Leaf</b> blade broadly to narrowly ovate or elliptic, 3–11 × 3–8 cm, base rounded, obtuse, or cuneate, sometimes nearly cordate, margins serrulate to coarsely doubly serrate, apex acute to rounded; surfaces abaxially glabrous to tomentose, lightly to heavily resin-coated. <b>Inflorescences</b>: staminate catkins in 1 cluster of 2–4, formed late in growing season before flowering and exposed during winter; pistillate catkins in 1 or more clusters of 2–10, formed season before blooming, enclosed in buds during winter, exposed with new growth in spring. <b>Flowering</b> with new growth in spring. <b>Infructescences</b> ovoid to ellipsoid or nearly cylindric; peduncles relatively long, thin. <b>Samaras</b> elliptic to obovate, wings wider than body, membranaceous.</span><!--

-->{{Treatment/Body
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Alaska;Calif.;Idaho;Maine;Mass.;Mich.;Minn.;Mont.;N.C.;N.H.;N.Y.;Oreg.;Pa.;Tenn.;Vt.;Wash.;Wis.;Wyo.;Southern arctic;subarctic;and n mountainous regions;North America and Asia.
|discussion=<p>Subspecies 4 (3 in the flora).</p><!--
--><p><i>Alnus viridis</i> is distinctive among the alders in its essentially sessile buds with several imbricate scales and in its relatively long, thin, infructescence peduncles. Like the birches, only the staminate catkins are exposed during the winter prior to blooming.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaf blade coarsely doubly serrate, thin, light or yellowish green, glabrous to sparsely pubescent; mountainous nw United States, Alaska, and Canada.
|[[Alnus viridis subsp. sinuata|Alnus viridis subsp. sinuata]]
|-id=key-0-1
|1
|Leaf blade serrulate to finely and densely serrate or doubly serrate, firm, dark green, sometimes abaxially sparsely to densely pubescent.
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaf blade broadly to narrowly ovate or elliptic, margins serrulate or finely serrate, apex obtuse to acute; e United States, n Canada, Alaska, and s Greenland.
|[[Alnus viridis subsp. crispa|Alnus viridis subsp. crispa]]
|-id=key-0-2
|2
|Leaf blade broadly ovate, margins sharply and densely doubly serrate, apex acute to short-acuminate; w coastal North America, adjacent subarctic Asia.
|[[Alnus viridis subsp. fruticosa|Alnus viridis subsp. fruticosa]]
|}
</div></div><!--

-->{{#Taxon:
name=Alnus alnobetula
|authority=(Ehrhart) K. Koch
|rank=species
|parent rank=genus
|synonyms=Alnus ovata;Alnus viridis
|basionyms=Betula alnobetula
|family=Betulaceae
|distribution=Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Alaska;Calif.;Idaho;Maine;Mass.;Mich.;Minn.;Mont.;N.C.;N.H.;N.Y.;Oreg.;Pa.;Tenn.;Vt.;Wash.;Wis.;Wyo.;Southern arctic;subarctic;and n mountainous regions;North America and Asia.
|reference=None
|publication title=Dendrologie
|publication year=1872
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V3/V3_755.xml
|subfamily=Betulaceae subfam. Betuloideae
|genus=Alnus
|species=Alnus alnobetula
}}<!--

-->

[[Category:Treatment]]
[[Category:Alnus]]
[[Category:Revised Since Print]]