View source for Cirsium occidentale var. candidissimum

{{Treatment/ID
|accepted_name=Cirsium occidentale var. candidissimum
|accepted_authority=(Greene) J. F. Macbride
|publications={{Treatment/Publication
|title=Contr. Gray Herb.
|place=53: 22. 1918
|year=1918
}}
|common_names=Snowy thistle
|basionyms={{Treatment/ID/Synonym
|name=Carduus candidissimus
|authority=Greene
}}
|synonyms={{Treatment/ID/Synonym
|name=Cirsium occidentale subsp. candidissimum
|authority=(Greene) Petrak
}} {{Treatment/ID/Synonym
|name=Cirsium pastoris
|authority=unknown
}}
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Cirsium;Cirsium occidentale;Cirsium occidentale var. candidissimum
|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 occidentale]]</div><div class="higher-taxon"><small>variety</small>[[Cirsium occidentale var. candidissimum]]</div></div>
|volume=Volume 19
|mention_page=page 131, 137
|treatment_page=page 140
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>erect or ± bushy, usually 40–200 cm, (branches often stiffly spreading), densely white-tomentose. <b>Leaf</b> faces densely white-tomentose. <b>Heads</b> sometimes in tight clusters at ends of peduncles, short- to long-pedunculate, elevated well above proximal leaves. <b>Involucres</b> as wide as to longer than wide, usually 2–6 cm, persistently and densely white-tomentose. <b>Phyllaries</b> imbricate or subequal, outer usually very long, spreading to reflexed, mid apices usually 1.5–3 cm × 2–3 mm, rigidly spreading or reflexed. <b>Corollas</b> red (rarely white or pink), 26–40 mm. <b>2n</b> = 30, 31, 32, 33, 34, 60.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer (Apr–Sep).
|habitat=Coastal scrub, grassy openings in montane coniferous forests, arid woodlands, sagebrush scrub, roadsides
|elevation=150–1500 m
|distribution=Calif.;Nev.;Oreg.
|discussion=<p>Variety candidissimum is a very attractive taxon with snowy, white-tomentose foliage and involucres and bright red corollas. It comes into contact with <i></i>var.<i> venustum</i> in the North Coast Ranges of California, and individuals of some populations are difficult to place with confidence into either variety. Some plants of northern <i>Nevada</i> are also intermediate in their features between <i></i>var.<i> candidissimum</i> and <i></i>var.<i> venustum</i>.</p><!--
--><p>Most populations of <i></i>var.<i> candidissimum</i> occur in the mountains of northern California. Upland populations range from the Klamath Range of southwestern Oregon to the northern North Coast Ranges of northern California and eastward through the Siskiyou and Cascade ranges and the northern Sierra <i>Nevada</i> to mountains of the Basin and Range Province in northeastern California and adjacent northwestern <i>Nevada</i>. An isolated occurrence in the Blue Mountains of northeastern Oregon may represent an introduction.</p><!--
--><p>A remarkable lowland population from the Carmel Highlands range of central coastal California occurs on shrub-covered hillsides adjacent to coastal redwood groves. Its habitat is markedly different from that of the upland populations, but I have found no morpologic basis for recognizing it as a distinct taxon. One plant in the population was observed to have purple instead of red corollas–perhaps a result of past hybridization with <i></i>var.<i> occidentale</i>.</p><!--
--><p>Heads of <i></i>var.<i> candidissimum</i> are actively visited by hummingbirds as well as a variety of insects (P. L. Barlow-Irick 2002).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cirsium occidentale var. candidissimum
|author=
|authority=(Greene) J. F. Macbride
|rank=variety
|parent rank=species
|synonyms=Cirsium occidentale subsp. candidissimum;Cirsium pastoris
|basionyms=Carduus candidissimus
|family=Asteraceae
|phenology=Flowering summer (Apr–Sep).
|habitat=Coastal scrub, grassy openings in montane coniferous forests, arid woodlands, sagebrush scrub, roadsides
|elevation=150–1500 m
|distribution=Calif.;Nev.;Oreg.
|reference=None
|publication title=Contr. Gray Herb.
|publication year=1918
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V19_121.xml
|tribe=Asteraceae tribe Cardueae
|genus=Cirsium
|species=Cirsium occidentale
|variety=Cirsium occidentale var. candidissimum
}}<!--

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