View source for Acroptilon repens

{{Treatment/ID
|accepted_name=Acroptilon repens
|accepted_authority=(Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
|publications={{Treatment/Publication
|title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr.
|place=6: 663. 1838
|year=1838
}}
|basionyms={{Treatment/ID/Basionym
|name=Centaurea repens
|authority=Linnaeus
|rank=species
|publication_title=Sp. Pl. ed.
|publication_place=2, 2: 1293. 1763
}}
|synonyms={{Treatment/ID/Synonym
|name=Acroptilon picris
|authority=(Pallas ex Willdenow) C. A. Meyer
|rank=species
}} {{Treatment/ID/Synonym
|name=C. picris
|authority=Pallas ex Willdenow
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Acroptilon;Acroptilon repens
|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 class="higher-taxon"><small>species</small>[[Acroptilon repens]]</div></div>
|volume=Volume 19
|mention_page=
|treatment_page=page 172
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Creeping </b>roots usually dark brown or black, with scaly adventitious buds. <b>Stems</b> ± cobwebby-tomentose. <b>Leaves</b>: basal and proximal cauline often deciduous by flowering, blades oblong, 4–15 cm; mid and distal linear to linear-lanceolate or oblong, 1–7 cm. <b>Involucres</b> 9–17 mm, loosely cobwebby. <b>Phyllaries</b>: apices of inner acute or acuminate, densely short-pilose. <b>Corollas</b> 11–14 mm, tubes 6.5–7.5 mm, throats 2–3.5 mm, lobes 3–3.5 mm. <b>Cypselae</b> ivory to grayish or brown, 2–4 mm; pappus bristles white, 6–11 mm. <b>2n</b> = 26.</span><!--

-->{{Treatment/Body
|phenology=Flowering late spring–summer (May–Sep).
|habitat=Fields, roadsides, riverbanks, ditch banks, clearcuts, cultivated ground
|elevation=0–2300 m
|distribution=Alta.;B.C.;Man.;Ont.;Sask.;Ariz.;Calif.;Colo.;Idaho;Iowa;Kans.;Minn.;Mont.;Nebr.;Nev.;N.Mex.;N.Dak.;Okla.;Oreg.;S.Dak.;Tex.;Utah;Wash.;Wyo.;Mexico (Baja California);c Asia.
|discussion=<p><i>Acroptilon repens</i> has been reported also from Arkansas, Illinois, Indiana, Kentucky, Louisiana, Michigan, Missouri, New York, Ohio, Virginia, and Wisconsin; I have not seen specimens from those states.</p><!--
--><p><i>Acroptilon repens</i> is a serious weed pest, especially in the western United States. It is a strong competitor in infested areas, often forming dense colonies, and has allelopathic effects on other plants growing nearby. It is very difficult to control or eradicate once it becomes established. It reproduces vigorously from seed and spreads from adventitious buds borne on deep-seated runner roots. Root fragments readily regenerate as new individuals after cultivation. In addition, Russian knapweed is very poisonous to horses, causing neurological symptoms. Because of its bitter taste, it is usually avoided by grazing animals, and consequently it tends to spread when more palatable plants are consumed.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Acroptilon repens
|authority=(Linnaeus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
|rank=species
|parent rank=genus
|synonyms=Acroptilon picris;C. picris
|basionyms=Centaurea repens
|family=Asteraceae
|phenology=Flowering late spring–summer (May–Sep).
|habitat=Fields, roadsides, riverbanks, ditch banks, clearcuts, cultivated ground
|elevation=0–2300 m
|distribution=Alta.;B.C.;Man.;Ont.;Sask.;Ariz.;Calif.;Colo.;Idaho;Iowa;Kans.;Minn.;Mont.;Nebr.;Nev.;N.Mex.;N.Dak.;Okla.;Oreg.;S.Dak.;Tex.;Utah;Wash.;Wyo.;Mexico (Baja California);c Asia.
|introduced=true
|reference=None
|publication title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr.
|publication year=1838
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V19_188.xml
|tribe=Asteraceae tribe Cardueae
|genus=Acroptilon
|species=Acroptilon repens
}}<!--

-->[[Category:Treatment]][[Category:Acroptilon]]