View source for Acroptilon

{{Treatment/ID
|accepted_name=Acroptilon
|accepted_authority=Cassini in F. Cuvier
|publications={{Treatment/Publication
|title=in F. Cuvier, Dict. Sci. Nat. ed.
|place=2, 50: 464. 1827
|year=1827
}}
|common_names=Russian knapweed;creeping knapweed;Russian centaurea;mountain-bluet;Turkestan thistle;centaurée de Russie
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Acroptilon
|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>[[Acroptilon]]</div></div>
|etymology=Greek akron, tip, and ptilon, feather, describing the pappus bristles
|volume=Volume 19
|mention_page=page 7, 58, 67, 83
|treatment_page=page 171
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 30–100 cm, not spiny. <b>Stems</b> erect, branched distally or throughout, branches ascending, not winged. <b>Leaves</b>: basal and proximal cauline; sessile or petiolate; blade margins coarsely dentate or 1–2-pinnately lobed, margins of mid and distal cauline dentate or entire, faces loosely tomentose or glabrate, puberulent and resin-gland-dotted. <b>Heads</b> discoid, in (leafy-bracted) corymbiform or paniculiform arrays. <b>Involucres</b> ovoid to subspheric, constricted, 6–10 mm diam. <b>Phyllaries</b> many in 6–8 series, outer round to ovate, bases tightly appressed, margins entire, apices widely scarious, obtuse or acute, inner lanceolate, margins entire, apices acute to acuminate, those of innermost bristly-ciliate or -plumose. <b>Receptacles</b> flat, epaleate, bearing setiform scales (“flattened bristles”). <b>Florets</b> 15–36; corollas blue, pink, or white, tubes very slender, usually bent distally, throats abruptly expanded, lobes linear; anther bases short-tailed, apical appendages oblong; style branches: fused portions with slightly swollen basal nodes minutely hairy, distally papillate, distinct portions very short, apices triangular. <b>Cypselae</b> obovoid, slightly compressed, smooth or with indistinct ribs, glabrous, attachment scars subbasal; pappi ± falling, of many unequal setiform scales (“flattened bristles”), proximally barbed, distally plumose (at least the longer). <b>x</b> = 13.</span><!--

-->{{Treatment/Body
|distribution=Eurasia.
|discussion=<p>Species 1.</p><!--
--><p>In most American floristic literature <i>Acroptilon</i> has been included within <i>Centaurea</i>, from which it differs by the subbasal rather than lateral attachment scars on the cypselae and the absence of sterile outer florets. The chromosome base number x = 13 is higher than that in most species of <i>Centaurea</i> in the strict sense. Molecular phylogenetic studies of the relationships of Cynareae genera (A. Susanna et al. 1995) support the segregation of <i>Acroptilon</i> from <i>Centaurea</i>.</p>
|tables=
|references={{Treatment/Reference
|id=watson1980a
|text=Watson, A. K. 1980. The biology of Canadian weeds. 43. Acroptilon (Centaurea) repens (L.) DC. Canad. J. Pl. Sci. 60: 993–1004.
}}
}}<!--

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-->{{#Taxon:
name=Acroptilon
|author=David J. Keil
|authority=Cassini in F. Cuvier
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=Eurasia.
|introduced=true
|reference=watson1980a
|publication title=in F. Cuvier, Dict. Sci. Nat. ed.
|publication year=1827
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V19_187.xml
|tribe=Asteraceae tribe Cardueae
|genus=Acroptilon
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Cardueae]]