Difference between revisions of "Arctium tomentosum"
Gard. Dict. ed. 8, Arctium no. 3. 1768.
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|common_names=Woolly burdock;bardane tomenteuse | |common_names=Woolly burdock;bardane tomenteuse | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=I | ||
| + | |label=Introduced | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms= | |synonyms= | ||
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|elevation=0–1600 m | |elevation=0–1600 m | ||
|distribution=Alta.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Sask.;Colo.;Conn.;Maine;Mass.;Minn.;Mo.;N.H.;N.Dak.;Ohio;S.Dak.;Vt.;Eurasia. | |distribution=Alta.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Sask.;Colo.;Conn.;Maine;Mass.;Minn.;Mo.;N.H.;N.Dak.;Ohio;S.Dak.;Vt.;Eurasia. | ||
| + | |introduced=true | ||
|discussion=<p><i>Arctium tomentosum</i> has been reported from Illinois, Iowa, Maryland, New Jersey, Oregon, Pennsylvania, South Carolina, and Wisconsin; I have not seen specimens.The involucres of <i>Arctium tomentosum</i> are usually very densely cobwebby.</p><!-- | |discussion=<p><i>Arctium tomentosum</i> has been reported from Illinois, Iowa, Maryland, New Jersey, Oregon, Pennsylvania, South Carolina, and Wisconsin; I have not seen specimens.The involucres of <i>Arctium tomentosum</i> are usually very densely cobwebby.</p><!-- | ||
--><p>Exceptional forms of <i>A. tomentosum</i> have nearly glabrous involucres. Forms of <i>A. minus</i> with especially cobwebby involucres have been misidentified as <i>A. tomentosum</i>; they lack the corymbiform capitulescence and glandular corollas of the latter.</p> | --><p>Exceptional forms of <i>A. tomentosum</i> have nearly glabrous involucres. Forms of <i>A. minus</i> with especially cobwebby involucres have been misidentified as <i>A. tomentosum</i>; they lack the corymbiform capitulescence and glandular corollas of the latter.</p> | ||
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|publication title=Gard. Dict. ed. | |publication title=Gard. Dict. ed. | ||
|publication year=1768 | |publication year=1768 | ||
| − | |special status= | + | |special status=Introduced |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_185.xml |
|tribe=Asteraceae tribe Cardueae | |tribe=Asteraceae tribe Cardueae | ||
|genus=Arctium | |genus=Arctium | ||
Latest revision as of 19:49, 5 November 2020
Plants to 250 cm. Basal leaves: petioles hollow or solid, 10–15 cm, glandular-hairy; blades 30–40 × 16–28 cm, coarsely dentate to subentire, abaxially white-tomentose, adaxially green, sparsely short-hairy. Heads usually in corymbiform clusters, long-pedunculate. Peduncles 1.5–12 cm. Involucres 15–25 mm diam., densely cobwebby (rarely glabrate). Phyllaries linear to linear-lanceolate, inner usually purplish, margins with minute spreading or reflexed glandular hairs. Florets 30+; corollas rose-purple, (occasionally white), 9–13 mm, limb minutely glandular. Cypselae light brown, 5–8 mm; pappus bristles 1–3 mm. 2n = 36.
Phenology: Flowering summer–early fall (Jul–Oct).
Habitat: Waste places, roadsides, fields, forest clearings
Elevation: 0–1600 m
Distribution
Introduced; Alta., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Sask., Colo., Conn., Maine, Mass., Minn., Mo., N.H., N.Dak., Ohio, S.Dak., Vt., Eurasia.
Discussion
Arctium tomentosum has been reported from Illinois, Iowa, Maryland, New Jersey, Oregon, Pennsylvania, South Carolina, and Wisconsin; I have not seen specimens.The involucres of Arctium tomentosum are usually very densely cobwebby.
Exceptional forms of A. tomentosum have nearly glabrous involucres. Forms of A. minus with especially cobwebby involucres have been misidentified as A. tomentosum; they lack the corymbiform capitulescence and glandular corollas of the latter.
Selected References
None.