View source for Arctium ← Arctium You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Arctium |accepted_authority=Linnaeus |publications={{Treatment/Publication |title=Sp. Pl. |place=2: 816. 1753 |year=1753 }}{{Treatment/Publication |title=Gen. Pl. ed. |place=5, 357. 1754 |year=1754 }} |common_names=Burdock;clotbur;bardane |basionyms= |synonyms= |hierarchy=Asteraceae;Asteraceae tribe Cardueae;Arctium |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>[[Arctium]]</div></div> |etymology=Greek arktion, from arktos, bear, perhaps alluding to rough involucre |volume=Volume 19 |mention_page=page 28, 58, 83, 169 |treatment_page=page 168 }}<!-- --><span class="statement" id="st-undefined" data-properties=""><b>Biennials </b>or (monocarpic) perennials, 50–300 cm; herbage not spiny. <b>Stems</b> erect, openly branched, branches ascending. <b>Leaves</b> basal and cauline; long-petiolate; gradually smaller distally; blade margins entire or dentate (pinnately lobed or dissected), faces abaxially resin-gland-dotted, adaxially often tomentose. <b>Heads</b> discoid, in leafy-bracted racemiform to paniculiform or corymbiform arrays. (Peduncles 0 or 1–9 cm.) Involucres spheric to ovoid. <b>Phyllaries</b> many in 9–17 series, outer and mid narrowly linear, bases appressed, margins entire, apices stiffly radiating, hooked-spiny tipped, inner linear, ascending or erect, straight tipped. <b>Receptacles</b> ± flat, epaleate, bearing subulate scales. <b>Florets</b> (5–)20–40+; corollas pink to ± purple, glabrous or glandular-puberulent, tubes elongate, throats campanulate, lobes narrowly triangular, ± equal; anther bases tailed, apical appendages ovate, obtuse to acute; style branches: fused portions distally hairy-ringed, distinct portions oblong, acute or obtuse. <b>Cypselae</b> obovoid, ± compressed, rough or ribbed, glabrous, attachment scars basal; pappi falling, of many bristles in 2–4 series. <b>x</b> = 18.</span><!-- -->{{Treatment/Body |distribution=Eurasia;n Africa;widely introduced worldwide. |discussion=<p>Species 10 (3 in the flora).</p><!-- --><p>At maturity the dry heads of Arctium species are readily caducous with the enclosed cypselae, and the hooked phyllary tips cling easily to fur or fabrics. Animal dispersal is a major factor in the spread of burdock species across North America. The burs are a major problem when they become entangled in the wool of sheep and fur of dogs and other animals.</p><!-- --><p>Published chromosome reports for Arctium other than n = 18 are probably in error because of difficulty in interpretation of somatic chromosomes (R. J. Moore and C. Frankton 1974).</p> |tables= |references={{Treatment/Reference |id=arenes1950a |text=Arènes, J. 1950. Monographie du genre Arctium L. Bull. Jard. Bot. État Bruxelles 29: 67–156. }}{{Treatment/Reference |id=duistermaat1996a |text=Duistermaat, H. 1996. Monograph of Arctium L. (Asteraceae). Gorteria, suppl. 3: 1–143. }} }}<!-- --><div class="treatment-key"> ==Key== <div class="treatment-key-group"> {| class="wikitable fna-keytable" |-id=key-0-1 |1 |Heads usually sessile to short-pedunculate in racemiform or paniculiform clusters. |[[Arctium minus|Arctium minus]] |-id=key-0-1 |1 |Heads usually long-pedunculate in corymbiform clusters |[[#key-0-2| > 2]] |-id=key-0-2 |2 |Involucre 2.5–4 cm diam.; phyllary apices glabrous or loosely cobwebby; corollas glabrous |[[Arctium lappa|Arctium lappa]] |-id=key-0-2 |2 |Involucre 1.5–2.5 mm diam.; phyllary apices densely cobwebby; corollas minutely glandular-puberulent |[[Arctium tomentosum|Arctium tomentosum]] |} </div></div><!-- -->{{#Taxon: name=Arctium |author=David J. Keil |authority=Linnaeus |rank=genus |parent rank=tribe |synonyms= |basionyms= |family=Asteraceae |distribution=Eurasia;n Africa;widely introduced worldwide. |introduced=true |reference=arenes1950a;duistermaat1996a |publication title=Sp. Pl.;Gen. Pl. ed. |publication year=1753;1754 |special status= |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V19_183.xml |tribe=Asteraceae tribe Cardueae |genus=Arctium }}<!-- -->[[Category:Treatment]][[Category:Asteraceae tribe Cardueae]] Templates used on this page: Template:Asteraceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/Publication (view source) Template:Treatment/Reference (view source) Return to Arctium.