View source for Dryopteris expansa

{{Treatment/ID
|accepted_name=Dryopteris expansa
|accepted_authority=(C. Presl) Fraser Jenkins & Jermy
|publications={{Treatment/Publication
|title=Brit. Fern Gaz.
|place=11: 338. 1977
|year=1977
}}
|common_names=Northern wood fern;spreading wood fern;dryoptère dressée
|basionyms={{Treatment/ID/Basionym
|name=Nephrodium expansum
|authority=C. Presl
|rank=species
|publication_title=Reliq. Haenk.
|publication_place=1: 38. 1825
}}
|synonyms={{Treatment/ID/Synonym
|name=Dryopteris assimilis
|authority=S. Walker
|rank=species
}} {{Treatment/ID/Synonym
|name=Dryopteris dilatata subsp. americana
|authority=(Fischer) Hultén
|rank=subspecies
}}
|hierarchy=Dryopteridaceae;Dryopteris;Dryopteris expansa
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dryopteridaceae]]</div><div class="higher-taxon"><small>genus</small>[[Dryopteris]]</div><div class="higher-taxon"><small>species</small>[[Dryopteris expansa]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Leaves </b>monomorphic, tardily dying back in winter, to 90 × 30 cm. <b>Petiole</b> 1/3 length of leaf, scaly at least at base; scales scattered, brown with dark brown stripe. <b>Blade</b> green, deltate-ovate, 3-pinnate-pinnatifid, herbaceous, usually not glandular, occasionally finely and densely glandular. <b>Pinnae</b> ± in plane of blade, lanceolate-oblong; basal pinnae deltate, slightly reduced, basal pinnules equal to or longer than adjacent pinnules, basal basiscopic pinnule longer than basal acroscopic pinnule; pinnule margins serrate. <b>Sori</b> midway between midvein and margin of segments. <b>Indusia</b> lacking glands or sparsely glandular. <b>2n</b> = 82.</span><!--

-->{{Treatment/Body
|habitat=Cool moist woods and rocky slopes
|elevation=50–1500 m
|distribution=Greenland;Alta.;B.C.;Nfld. and Labr. (Labr.);N.W.T.;Ont.;Que.;Yukon;Alaska;Calif.;Idaho;Mich.;Minn.;Mont.;Oreg.;Wash.;Wis.;Wyo.;Europe.
|discussion=<p><i>Dryopteris expansa</i> is diploid and is one of the parents of <i>D. campyloptera</i>. Where their ranges overlap in eastern Canada, these two species are very difficult to distinguish except by chromosome number. The growth habit (<i>D. expansa</i> leaves are more erect) is useful in the field. Three hybrids involving <i>D. expansa</i> are known; all are very rare.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Dryopteris expansa
|authority=(C. Presl) Fraser Jenkins & Jermy
|rank=species
|parent rank=genus
|synonyms=Dryopteris assimilis;Dryopteris dilatata subsp. americana
|basionyms=Nephrodium expansum
|family=Dryopteridaceae
|habitat=Cool moist woods and rocky slopes
|elevation=50–1500 m
|distribution=Greenland;Alta.;B.C.;Nfld. and Labr. (Labr.);N.W.T.;Ont.;Que.;Yukon;Alaska;Calif.;Idaho;Mich.;Minn.;Mont.;Oreg.;Wash.;Wis.;Wyo.;Europe.
|reference=None
|publication title=Brit. Fern Gaz.
|publication year=1977
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V2/V2_405.xml
|genus=Dryopteris
|species=Dryopteris expansa
}}<!--

-->[[Category:Treatment]][[Category:Dryopteris]]