View source for Polystichum andersonii

{{Treatment/ID
|accepted_name=Polystichum andersonii
|accepted_authority=M. Hopkins
|publications={{Treatment/Publication
|title=Amer. Fern J.
|place=3: 116, plate 9. 1913
|year=1913
}}
|common_names=Anderson's sword fern
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Polystichum braunii subsp. andersonii
|authority=(M. Hopkins) Calder & Roy L. Taylor
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Polystichum braunii var. andersonii
|authority=(M. Hopkins) Hultén
|rank=variety
}}
|hierarchy=Dryopteridaceae;Polystichum;Polystichum andersonii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dryopteridaceae]]</div><div class="higher-taxon"><small>genus</small>[[Polystichum]]</div><div class="higher-taxon"><small>species</small>[[Polystichum andersonii]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>erect. <b>Leaves</b> monomorphic, arching, 3–10 dm; bulblets 1 or more, on distal 1/3 of rachis. <b>Petiole</b> 1/8–1/4 length of leaf, densely scaly; scales light brown, diminishing in size distally. <b>Blade</b> lanceolate, 1-pinnate-pinnatifid; base narrowed. <b>Pinnae</b> lanceolate-falcate, proximal pinnae ± triangular, not overlapping, in 1 plane, 2–10 cm; base oblique, acroscopic auricle well developed; margins incised to costae, segments adnate to costa for at least 2 mm, serrulate-spiny with teeth ascending; apex acute with subapical and apical teeth same size; microscales filiform, with contorted projections, dense abaxially, sparse adaxially. <b>Indusia</b> sparsely ciliate. <b>Spores</b> light brown to brown. <b>2n</b> = 164.</span><!--

-->{{Treatment/Body
|habitat=Lowland coastal to midmontane forests, interior moist forests
|elevation=100–1700 m
|distribution=B.C.;Alaska;Idaho;Mont.;Oreg.;Wash.
|discussion=<p><i>Polystichum andersonii</i> is an allotetraploid (D. H. Wagner 1979); its diploid parents are <i>P. munitum</i> and <i>P. kwakiutlii</i>. The triploid cross, <i>P. munitum</i> × andersonii, has been analyzed cytologically (W. H. Wagner Jr. 1973). It is the only sterile hybrid in the genus that develops large colonies through vegetative propagation by its bulblets. Hybrids look very much like some of the more deeply incised forms of <i>Polystichum munitum</i> except that they have abundant filiform scales, abortive sori, and nearly triangular lowermost pinnae with ± equally incised acroscopic and basiscopic auricles.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Polystichum andersonii
|authority=M. Hopkins
|rank=species
|parent rank=genus
|synonyms=Polystichum braunii subsp. andersonii;Polystichum braunii var. andersonii
|basionyms=
|family=Dryopteridaceae
|habitat=Lowland coastal to midmontane forests, interior moist forests
|elevation=100–1700 m
|distribution=B.C.;Alaska;Idaho;Mont.;Oreg.;Wash.
|reference=None
|publication title=Amer. Fern J.
|publication year=1913
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V2/V2_378.xml
|genus=Polystichum
|species=Polystichum andersonii
}}<!--

-->[[Category:Treatment]][[Category:Polystichum]]