View source for Cirsium clavatum var. osterhoutii

{{Treatment/ID
|accepted_name=Cirsium clavatum var. osterhoutii
|accepted_authority=(Rydberg) D. J. Keil
|publications={{Treatment/Publication
|title=Sida
|place=21: 212. 2004
|year=2004
}}
|common_names=Osterhout’s thistle
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Carduus osterhoutii
|authority=Rydberg
|rank=species
|publication_title=Bull. Torrey Bot. Club
|publication_place=32: 131. 1905
}}
|synonyms={{Treatment/ID/Synonym
|name=Cirsium osterhoutii
|authority=(Rydberg) Petrak
|rank=species
}} {{Treatment/ID/Synonym
|name=Cirsium araneans
|authority=Rydberg
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Cirsium;Cirsium clavatum;Cirsium clavatum var. osterhoutii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cardueae]]</div><div class="higher-taxon"><small>genus</small>[[Cirsium]]</div><div class="higher-taxon"><small>species</small>[[Cirsium clavatum]]</div><div class="higher-taxon"><small>variety</small>[[Cirsium clavatum var. osterhoutii]]</div></div>
|volume=Volume 19
|mention_page=page 127
|treatment_page=page 128
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="leaf face pubescence"><b>Abaxial </b>leaf faces ± tomentose.</span> <span class="statement" id="st-d0_s1" data-properties="involucre shape;involucre length;involucre width;involucre architecture or pubescence or shape;involucre pubescence;trichome length or size;trichome architecture;phyllary arrangement"><b>Involucres </b>ovoid to campanulate, 2–2.8 × 1.5–3 cm, villous-ciliate with long septate trichomes connecting adjacent phyllaries and/or thinly arachnoid-tomentose.</span> <span class="statement" id="st-d0_s2" data-properties="subapical patch coloration;subapical patch shape;appendage shape;face shape;ridge size or width;ridge coating;ridge prominence"><b>Phyllaries </b>in 5–6 series, imbricate or subequal, green or with maroon to dark-brown subapical patch or appendage, linear to linear-lanceolate, abaxial faces with narrow glutinous ridge that often concealed by trichomes;</span> <span class="statement" id="st-d0_s3" data-properties="outer and middle base fixation or orientation;apical appendage orientation;apical appendage orientation;apical appendage shape;apical appendage architecture or shape;apical appendage architecture or shape;spine orientation;spine orientation;spine some measurement">outer and middle bases appressed, apical appendages erect or stiffly ascending, linear-lanceolate to acicular, entire or spinulose-dentate, spines erect or ascending, 2–5 mm;</span> <span class="statement" id="st-d0_s4" data-properties="base apex course;base apex orientation;base apex size or width;base apex prominence or shape;base apex architecture or shape;base apex size;base apex texture;base apex architecture or shape">apices of inner sometimes flexuous or reflexed, narrow, flat, and entire or expanded, scarious, and lacerate-dentate.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer (Jul–Aug).
|habitat=Openings in montane coniferous forests, subalpine, alpine
|elevation=3000–3600 m
|distribution=Colo.
|discussion=<p>The densely pubescent involucre of var. osterhoutii is a feature that links those plants with Cirsium eatonii var. eriocephalum. Some specimens tentatively assigned to C. clavatum var. osterhoutiii may be derivatives of past introgression with C. eatonii var. eriocephalum. Congested heads and strongly undulate leaves with numerous closely spaced lobes are features that suggest such a relationship. Further studies at both population and regional levels are needed to establish the nature of the variation patterns. Where I have observed var. osterhoutii in the field, populations appeared to be morpologically stable, and there was no evidence of current introgression with C. eatonii.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cirsium clavatum var. osterhoutii
|authority=(Rydberg) D. J. Keil
|rank=variety
|parent rank=species
|synonyms=Cirsium osterhoutii;Cirsium araneans
|basionyms=Carduus osterhoutii
|family=Asteraceae
|phenology=Flowering summer (Jul–Aug).
|habitat=Openings in montane coniferous forests, subalpine, alpine
|elevation=3000–3600 m
|distribution=Colo.
|reference=None
|publication title=Sida
|publication year=2004
|special status=Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V19_93.xml
|tribe=Asteraceae tribe Cardueae
|genus=Cirsium
|species=Cirsium clavatum
|variety=Cirsium clavatum var. osterhoutii
|apical appendage architecture or shape=spinulose-dentate;entire
|apical appendage orientation=ascending;erect
|apical appendage shape=linear-lanceolate;acicular
|appendage shape=linear;linear-lanceolate
|base apex architecture or shape=lacerate-dentate;entire
|base apex course=flexuous
|base apex orientation=reflexed
|base apex prominence or shape=flat
|base apex size=expanded
|base apex size or width=narrow
|base apex texture=scarious
|face shape=linear;linear-lanceolate
|involucre architecture or pubescence or shape=villous-ciliate
|involucre length=2cm;2.8cm
|involucre pubescence=arachnoid-tomentose
|involucre shape=ovoid;campanulate
|involucre width=1.5cm;3cm
|leaf face pubescence=tomentose
|outer and middle base fixation or orientation=appressed
|phyllary arrangement=adjacent
|ridge coating=glutinous
|ridge prominence=concealed
|ridge size or width=narrow
|spine orientation=ascending;erect
|spine some measurement=2mm;5mm
|subapical patch coloration=maroon;dark-brown
|subapical patch shape=linear;linear-lanceolate
|trichome architecture=septate
|trichome length or size=long
}}<!--

-->[[Category:Treatment]][[Category:Cirsium clavatum]]