View source for Centaurea virgata subsp. squarrosa

{{Treatment/ID
|accepted_name=Centaurea virgata subsp. squarrosa
|accepted_authority=(Boissier) Gugler
|publications={{Treatment/Publication
|title=Ann. Hist.-Nat. Mus. Natl. Hung.
|place=6: 248. 1908
|year=1908
}}
|common_names=Squarrose knapweed
|basionyms={{Treatment/ID/Basionym
|name=Centaurea virgata var. squarrosa
|authority=Boissier
|publication_title=Fl. Orient.
|publication_place=3: 651. 1875,
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Centaurea;Centaurea virgata;Centaurea virgata subsp. squarrosa
|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>[[Centaurea]]</div><div class="higher-taxon"><small>species</small>[[Centaurea virgata]]</div><div class="higher-taxon"><small>subspecies</small>[[Centaurea virgata subsp. squarrosa]]</div></div>
|volume=Volume 19
|mention_page=
|treatment_page=page 191
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 20–50 cm, scabrous. <b>Stems</b> several, diffusely much-branched distally, finely tomentose, minutely resin-gland-dotted. <b>Leaves</b> finely tomentose, minutely resin-gland-dotted; basal and proximal cauline petiolate, often absent at anthesis, blades 10–15 cm, margins 1–2 times pinnately divided into linear segments; mid and distal cauline sessile, smaller, pinnately divided or simple. <b>Heads</b> disciform, in paniculiform arrays, sessile or short-pedunculate. <b>Involucres</b> narrowly ovoid or cylindric, 7–8 × 3–5 mm, falling at maturity with enclosed cypselae. <b>Principal</b> phyllaries: bodies pale green or stramineous, ovate to lanceolate, sometimes purple-tinged, glabrous or finely tomentose, sparsely resin-gland-dotted, margins scarious, appendages spreading, fringed with slender stramineous spines, each tipped by spreading to reflexed spine 1–3 mm. <b>Inner</b> phyllaries lanceolate, ± acute. <b>Florets</b> 10–14(–16); corollas pink or pale purple, those of sterile florets very slender, 3-lobed, linear, not exceeding disc corollas, those of fertile florets 7–9 mm. <b>Cypselae</b> light brown or stramineous, 2.5–3.5 mm, glabrous; pappi of white bristles 1–2.5 mm or sometimes very reduced. <b>2n</b> = 36.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer (Jun–Sep).
|habitat=Rangelands, pastures, open forests, roadsides
|elevation=1000–2000 m
|distribution=Calif.;Colo.;Mich.;Nev.;Oreg.;Utah;Wyo.;w Asia.
|discussion=<p>Squarrose knapweed is an invasive pest in rangelands of western North America. At maturity the fruiting heads readily fall from the plant and can become lodged in the fur of animals. <i>Centaurea virgata </i>subsp.<i> squarrosa</i> has been declared a noxious weed in several western states.</p><!--
--><p>In the Synthesis of the North American Flora (J. T. Kartesz and C. A. Meacham 1999) <i>Centaurea virgata</i> is incorrectly listed as a synonym of C. triumfettii Allioni, a very different plant. This was apparently based on a misreading of C. variegata Lamarck (not a legitimate name), a synonym of C. triumfettii, as <i>C. virgata</i>.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Centaurea virgata subsp. squarrosa
|author=
|authority=(Boissier) Gugler
|rank=subspecies
|parent rank=species
|synonyms=
|basionyms=Centaurea virgata var. squarrosa
|family=Asteraceae
|phenology=Flowering summer (Jun–Sep).
|habitat=Rangelands, pastures, open forests, roadsides
|elevation=1000–2000 m
|distribution=Calif.;Colo.;Mich.;Nev.;Oreg.;Utah;Wyo.;w Asia.
|introduced=true
|reference=None
|publication title=Ann. Hist.-Nat. Mus. Natl. Hung.
|publication year=1908
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_220.xml
|tribe=Asteraceae tribe Cardueae
|genus=Centaurea
|species=Centaurea virgata
|subspecies=Centaurea virgata subsp. squarrosa
}}<!--

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