View source for Cirsium arizonicum var. tenuisectum

{{Treatment/ID
|accepted_name=Cirsium arizonicum var. tenuisectum
|accepted_authority=D. J. Keil
|publications={{Treatment/Publication
|title=Sida
|place=21: 210. 2004
|year=2004
}}
|common_names=Desert mountains thistle
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Cirsium;Cirsium arizonicum;Cirsium arizonicum var. tenuisectum
|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 arizonicum]]</div><div class="higher-taxon"><small>variety</small>[[Cirsium arizonicum var. tenuisectum]]</div></div>
|volume=Volume 19
|mention_page=page 142, 151
|treatment_page=page 144
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>thinly arachnoid tomentose, ± glabrate, without septate trichomes. <b>Leaf</b> blades deeply divided, often nearly to the midveins, abaxial faces arachnoid tomentose or sometimes glabrate, without septate trichomes, adaxial thinly arachnoid or glabrate; main marginal spines often stout, 5–30 mm; cauline bases narrowed to truncate or ± clasping, but not or only slightly decurrent. <b>Involucres</b> cylindric to campanulate. <b>Phyllary</b> spines stout, 5–25 mm. <b>Corollas</b> reddish purple, 25–35 mm, tubes 10–13, throats 5–8 mm, lobes 10–13.5 mm; style tips 1–2 mm. <b>2n</b> = 34 (as C. nidulum).</span><!--

-->{{Treatment/Body
|phenology=Flowering summer–fall (Jun–Nov).
|habitat=Rocky slopes, drainages, roadsides, pine-oak-juniper woodlands, montane coniferous forests
|elevation=1500–2800 m
|distribution=Calif.;Nev.
|discussion=<p>Of conservation concern.</p><!--
--><p>Variety tenuisectum occurs in the New York Mountains of southeastern California and the Spring Mountains of southwestern <i>Nevada</i>. The name <i>Cirsium</i> nidulum has long been misapplied to the plants here treated as <i></i>var.<i> tenuisectum</i> (e.g., P. A. Munz 1959; J. T. Howell 1960b; R. J. Moore and C. Frankton 1974b; D. J. Keil and C. E. Turner 1993). My examination of the type of C. nidulum indicates that the taxon is properly treated as a synonym of <i>C. arizonicum </i>var.<i> arizonicum</i>.</p><!--
--><p><i>Cirsium eatonii </i>var.<i> clokeyi</i> occurs in close proximity to <i>C. arizonicum </i>var.<i> tenuisectum</i> in the ski area of upper Lee Canyon in the Spring Mountains. I did not see any evidence of hybridization during my brief field survey in that area.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cirsium arizonicum var. tenuisectum
|author=
|authority=D. J. Keil
|rank=variety
|parent rank=species
|synonyms=
|basionyms=
|family=Asteraceae
|phenology=Flowering summer–fall (Jun–Nov).
|habitat=Rocky slopes, drainages, roadsides, pine-oak-juniper woodlands, montane coniferous forests
|elevation=1500–2800 m
|distribution=Calif.;Nev.
|reference=None
|publication title=Sida
|publication year=2004
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V19_129.xml
|tribe=Asteraceae tribe Cardueae
|genus=Cirsium
|species=Cirsium arizonicum
|variety=Cirsium arizonicum var. tenuisectum
}}<!--

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