View source for Cirsium pulcherrimum var. aridum

{{Treatment/ID
|accepted_name=Cirsium pulcherrimum var. aridum
|accepted_authority=(Dorn) D. J. Keil
|publications={{Treatment/Publication
|title=Sida
|place=21: 215. 2004
|year=2004
}}
|common_names=Cedar Rim thistle
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}
|basionyms={{Treatment/ID/Basionym
|name=Cirsium aridum
|authority=Dorn
|rank=species
|publication_title=Vasc. Pl. Wyoming ed.
|publication_place=2, 304, plate [p. 305]. 1992
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Cirsium;Cirsium pulcherrimum;Cirsium pulcherrimum var. aridum
|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 pulcherrimum]]</div><div class="higher-taxon"><small>variety</small>[[Cirsium pulcherrimum var. aridum]]</div></div>
|volume=Volume 19
|mention_page=
|treatment_page=page 126
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>often clustered from branched rootstock, 15–40 cm, bases not thickened. <b>Adaxial</b> leaf faces gray- to white-tomentose. <b>Heads</b> 1–4, in compact arrays. <b>Cypselae</b> without stramineous apical collars.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer (Jun–Aug).
|habitat=Barren slopes in shallow, stony soil in very open, arid grasslands
|elevation=2000–2200 m
|distribution=Wyo.
|discussion=<p>Of conservation concern.</p><!--
--><p>In describing variety aridum, Dorn suggested that it “seems to belong to the <i>C. hookerianum</i> group,” but I fail to see this relationship. Its affinities clearly lie with <i>Cirsium pulcherrimum</i>. It is usually differentiable from <i></i>var.<i> pulcherrimum</i> by the characters above, but it grows and intergrades with <i></i>var.<i> pulcherrimum</i> on the Sweetwater Plateau in Fremont County. W. Fertig (unpubl.) has studied the ecology and distribution of <i></i>var.<i> aridum</i> [as C. aridum] and the very similar pubescent forms of var. pulcherriumum [as <i>C. pulcherrimum</i>].</p><!--
--><p>Variety aridum occurs in scattered localities on barren hills in Carbon, Fremont, and Sweetwater counties. It is a rare taxon, but it has not received official recognition by governmental agencies. However it is in the Center for Plant Conservation’s National Collection of Endangered Plants.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cirsium pulcherrimum var. aridum
|authority=(Dorn) D. J. Keil
|rank=variety
|parent rank=species
|synonyms=
|basionyms=Cirsium aridum
|family=Asteraceae
|phenology=Flowering summer (Jun–Aug).
|habitat=Barren slopes in shallow, stony soil in very open, arid grasslands
|elevation=2000–2200 m
|distribution=Wyo.
|reference=None
|publication title=Sida
|publication year=2004
|special status=Endemic;Conservation concern
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_88.xml
|tribe=Asteraceae tribe Cardueae
|genus=Cirsium
|species=Cirsium pulcherrimum
|variety=Cirsium pulcherrimum var. aridum
}}<!--

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