View source for Helianthus ×laetiflorus

{{Treatment/ID
|accepted_name=Helianthus ×laetiflorus
|accepted_authority=Persoon
|publications={{Treatment/Publication
|title=Syn. Pl.
|place=2: 476. 1807
|year=1807
}}
|common_names=Hélianthe à belles fleurs
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Helianthus severus
|authority=E. Watson
|rank=species
}} {{Treatment/ID/Synonym
|name=Helianthus superbus
|authority=E. Watson
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Helianthinae;Helianthus;Helianthus ×laetiflorus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Heliantheae]]</div><div class="higher-taxon"><small>subtribe</small>[[Asteraceae (tribe Heliantheae) subtribe Helianthinae]]</div><div class="higher-taxon"><small>genus</small>[[Helianthus]]</div><div class="higher-taxon"><small>species</small>[[Helianthus ×laetiflorus]]</div></div>
|volume=Volume 21
|mention_page=page 142, 144, 147, 160
|treatment_page=page 161
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 100–200 cm (rhizomatous). <b>Stems</b> erect, slightly hairy. <b>Leaves</b> basal and cauline; mostly opposite; petioles 1–5 cm; blades lanceolate to lance-ovate, 10–25 × 2–8 cm, bases cuneate, margins serrulate to serrate, abaxial faces sparsely hispid, gland-dotted. <b>Heads</b> 3–6. <b>Peduncles</b> 7–14 cm. <b>Involucres</b> hemispheric, 14–18 mm diam. <b>Phyllaries</b> 25–35, oblong-lanceolate, 7–12 × 3–3.5 mm (strongly unequal), apices acuminate, abaxial faces usually puberulent, gland-dotted. <b>Paleae</b> 9–10 mm, entire or 3-toothed (apices reddish). <b>Ray</b> florets 15–20; laminae 25–37 mm. <b>Disc</b> florets 75+; corollas 7–7.5 mm, lobes reddish (at least at tips); anthers dark, appendages dark to yellowish (style branches yellow). <b>Cypselae</b> (seldom formed) 4–5 mm, glabrate; pappi of 2 aristate scales 2.5–3.5 mm. <b>2n</b> = 102.</span><!--

-->{{Treatment/Body
|phenology=Flowering late summer–fall.
|habitat=Roadsides, fields
|elevation=0–300+ m
|distribution=N.B.;Nfld. and Labr. (Nfld.);Ont.;Que.;Ala.;Conn.;Del.;D.C.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;N.H.;N.J.;N.Y.;N.C.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis.
|discussion=<p><i>Helianthus ×laetiflorus</i> is introduced in Ontario, Newfoundland, and probably in Quebec; it was excluded from British Columbia by G. W. Douglas et al. (1989–1994, vol. 1); and it was reported in New Brunswick by H. R. Hinds (2000).</p><!--
--><p>Plants called <i>Helianthus ×laetiflorus</i> are usually interpreted to be hybrids and backcrosses of <i>H. tuberosus</i> and <i>H. pauciflorus</i>; they are widely cultivated and often escape. An alternative treatment has been to use the name H. laetiflorus for plants that are treated here as <i>H. pauciflorus</i>, sometimes with infraspecific taxa.</p><!--
--><p><i>Helianthus atrorubens</i> Lamarck 1789, not Linnaeus 1753, has been applied to plants here called <i>H. ×laetiflorus</i>.</p>
|tables=
|references={{Treatment/Reference
|id=clevenger1963a
|text=Clevenger, S. and C. B. Heiser. 1963. Helianthus laetiflorus and Helianthus rigidus—hybrids or species? Rhodora 65: 121–133.
}}
}}<!--

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-->{{#Taxon:
name=Helianthus ×laetiflorus
|authority=Persoon
|rank=species
|parent rank=genus
|synonyms=Helianthus severus;Helianthus superbus
|basionyms=
|family=Asteraceae
|phenology=Flowering late summer–fall.
|habitat=Roadsides, fields
|elevation=0–300+ m
|distribution=N.B.;Nfld. and Labr. (Nfld.);Ont.;Que.;Ala.;Conn.;Del.;D.C.;Ga.;Ill.;Ind.;Iowa;Kans.;Ky.;Maine;Md.;Mass.;Mich.;Minn.;Mo.;Mont.;Nebr.;N.H.;N.J.;N.Y.;N.C.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;Tenn.;Tex.;Vt.;Va.;W.Va.;Wis.
|reference=clevenger1963a
|publication title=Syn. Pl.
|publication year=1807
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_388.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae
|genus=Helianthus
|species=Helianthus ×laetiflorus
}}<!--

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