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/Synonym
|name=Nephrodium expansum
|authority=C. Presl
}}
|synonyms={{Treatment/ID/Synonym
|name=Dryopteris assimilis
|authority=S. Walker
}}{{Treatment/ID/Synonym
|name=Dryopteris dilatata subsp. americana
|authority=(Fischer) Hultén
}}
|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.;N.W.T.;Ont.;Que.;Yukon;Alaska;Calif.;Idaho;Mich.;Minn.;Mont.;Oreg.;Wash.;Wis.;Wyo.;Europe.
|discussion=<p>Dryopteris expansa is diploid and is one of the parents of D. campyloptera. Where their ranges overlap in eastern Canada, these two species are very difficult to distinguish except by chromosome number. The growth habit (D. expansa leaves are more erect) is useful in the field. Three hybrids involving D. expansa are known; all are very rare.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Dryopteris expansa
|author=
|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.;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://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V2/V2_405.xml
|genus=Dryopteris
|species=Dryopteris expansa
}}<!--

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