View source for Helianthus angustifolius

{{Treatment/ID
|accepted_name=Helianthus angustifolius
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 906. 1753
|year=1753
}}
|common_names=Swamp sunflower
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Helianthus angustifolius var. planifolius
|authority=Fernald
|rank=variety
}}
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Helianthinae;Helianthus;Helianthus angustifolius
|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 angustifolius]]</div></div>
|volume=Volume 21
|mention_page=page 144, 147, 166
|treatment_page=page 164
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 50–150+ cm (with crown buds, rhizomes absent or poorly developed). <b>Stems</b> erect, usually ± hairy. <b>Leaves</b> mostly cauline; opposite or alternate; sessile or subsessile; blades (3-nerved near bases) narrowly lanceolate to linear, 8–15 × 0.15–0.5(–1) cm, bases cuneate, margins entire (revolute, abaxial face sometimes obscured by rolled margins), abaxial faces strigose to hispid or hirsute, sometimes (adaxial not) gland-dotted. <b>Heads</b> 3–16. <b>Peduncles</b> 5–15 cm. <b>Involucres</b> shallowly hemispheric, 10–20 mm diam. <b>Phyllaries</b> 25–32 (loose), lanceolate, 4–9 × 1–2 mm, apices acute to slightly acuminate, abaxial faces usually scabrous, rarely glabrous, usually gland-dotted. <b>Paleae</b> (oblanceolate) 5.5–6.5 mm, entire or ± 3-toothed (apices purplish, mucronate, gland-dotted). <b>Ray</b> florets 10–20; laminae 10–20 mm (abaxial faces gland-dotted). <b>Disc</b> florets 75+; corollas 4–4.5 mm, lobes yellow; anthers dark brown or black, appendages dark (style branches usually yellow). <b>Cypselae</b> 2–3 mm, glabrate; pappi of 2 aristate scales 1.5–2.1 mm. <b>2n</b> = 34.</span><!--

-->{{Treatment/Body
|phenology=Flowering late summer–fall.
|habitat=Open to shaded, usually moist places
|elevation=10–700 m
|distribution=Ala.;Ark.;Fla.;Ga.;Ind.;Iowa;Ky.;La.;Md.;Miss.;Mo.;N.J.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Tex.;Va.;W.Va.
|discussion=<p>The distal parts of <i>Helianthus angustifolius</i> are identical in appearance to those of <i>H. simulans</i>; plants of the latter are taller (200+ cm) and more robust. The leaves are not only narrower in <i>H. angustifolius</i> but also tend to be more strongly revolute (abaxial faces sometimes scarcely visible).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Helianthus angustifolius
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Helianthus angustifolius var. planifolius
|basionyms=
|family=Asteraceae
|phenology=Flowering late summer–fall.
|habitat=Open to shaded, usually moist places
|elevation=10–700 m
|distribution=Ala.;Ark.;Fla.;Ga.;Ind.;Iowa;Ky.;La.;Md.;Miss.;Mo.;N.J.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Tex.;Va.;W.Va.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_394.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae
|genus=Helianthus
|species=Helianthus angustifolius
}}<!--

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