View source for Crepis tectorum

{{Treatment/ID
|accepted_name=Crepis tectorum
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 807. 1753
|year=1753
}}
|common_names=Narrowleaf hawksbeard;crépis des troits
|special_status={{Treatment/ID/Special_status
|code=W
|label=Weedy
}}{{Treatment/ID/Special_status
|code=I
|label=Introduced
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Crepis;Crepis tectorum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cichorieae]]</div><div class="higher-taxon"><small>genus</small>[[Crepis]]</div><div class="higher-taxon"><small>species</small>[[Crepis tectorum]]</div></div>
|volume=Volume 19
|mention_page=page 223
|treatment_page=page 238
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 10–100 cm (taproots shallow). <b>Stems</b> 1, erect (fistulose), branched distally or from bases, tomentulose and/or hispid. <b>Leaves</b> basal and cauline; petiolate; blades lanceolate to oblanceolate, often coarsely runcinate, 5–15 × 1–4 cm, margins entire, denticulate, or dentate to pinnately lobed (lobes remote, coarse, unequal), apices acute to acuminate, abaxial faces glabrous or tomentose, adaxial glabrous (proximal cauline sessile, bases auriculate, distal usually linear, entire). <b>Heads</b> 5–20(–100+), in paniculiform or corymbiform arrays. <b>Calyculi</b> of ± 12, subulate, tomentose and hispidulous bractlets 2–5 mm (often becoming scarious). <b>Involucres</b> cylindro-campanulate, 6–9 × 7–8 mm. <b>Phyllaries</b> 12–15, lanceolate, 5–9 mm, (bases becoming keeled and thickened, margins scarious), apices acute to attenuate (white-ciliate, tomentulose), abaxial faces tomentose to hispidulous, adaxial with fine, appressed hairs. <b>Florets</b> 30–70; corollas yellow (without red on ligules), 10–13 mm. <b>Cypselae</b> dark reddish or purplish brown, fusiform, 3–4 mm, apices constricted (not beaked), ribs 10 (rounded, minutely spiculate); pappi white (fine, soft), 4–5 mm. <b>2n</b> = 8.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Sep.
|habitat=Dry, sandy, pine woods, disturbed places, abandoned fields, forest clearings, wooded slopes, dry streambeds
|elevation=100–300 m
|distribution=Greenland;Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Labr.);N.W.T.;N.S.;Ont.;Que.;Sask.;Yukon;Alaska;Calif.;Conn.;D.C.;Ill.;Ind.;Iowa;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Oreg.;Pa.;R.I.;Wash.;Wis.;Wyo.;Europe;introduced;Asia.
|introduced=true
|discussion=<p><i>Crepis tectorum</i> is recognized by its annual habit, keeled phyllaries with minute hairs on adaxial faces, and dark reddish or purplish brown cypselae. It is widespread, often abundant, occurs in a great variety of habitats, and is considered a noxious weed in some states.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Crepis tectorum
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|phenology=Flowering May–Sep.
|habitat=Dry, sandy, pine woods, disturbed places, abandoned fields, forest clearings, wooded slopes, dry streambeds
|elevation=100–300 m
|distribution=Greenland;Alta.;B.C.;Man.;N.B.;Nfld. and Labr. (Labr.);N.W.T.;N.S.;Ont.;Que.;Sask.;Yukon;Alaska;Calif.;Conn.;D.C.;Ill.;Ind.;Iowa;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;N.J.;N.Y.;N.C.;N.Dak.;Ohio;Oreg.;Pa.;R.I.;Wash.;Wis.;Wyo.;Europe;introduced;Asia.
|introduced=true
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=Weedy;Introduced
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_314.xml
|tribe=Asteraceae tribe Cichorieae
|genus=Crepis
|species=Crepis tectorum
}}<!--

-->[[Category:Treatment]][[Category:Crepis]]