View source for Helenium quadridentatum

{{Treatment/ID
|accepted_name=Helenium quadridentatum
|accepted_authority=Labillardière
|publications={{Treatment/Publication
|title=Actes Soc. Hist. Nat. Paris
|place=1: 22, plate 4. 1792
|year=1792
}}
|common_names=Longdisk sneezeweed
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Gaillardiinae;Helenium;Helenium quadridentatum
|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 Gaillardiinae]]</div><div class="higher-taxon"><small>genus</small>[[Helenium]]</div><div class="higher-taxon"><small>species</small>[[Helenium quadridentatum]]</div></div>
|volume=Volume 21
|mention_page=page 428
|treatment_page=page 434
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 30–100 cm. <b>Stems</b> usually 1, branched distally, moderately to strongly winged, glabrous or sparsely hairy. <b>Leaves</b> glabrous or sparsely hairy; blades narrowly elliptic to lance-linear, usually entire; proximal blades sometimes pinnately lobed. <b>Heads</b> 5–15(–50+) per plant, in paniculiform arrays. <b>Peduncles</b> 3–13 cm, sparsely to moderately hairy. <b>Involucres</b> ovoid to conic, 7–11(–14) × 6–11 mm. <b>Phyllaries</b> (connate proximally) sparsely to densely hairy. <b>Ray</b> florets 10–15, pistillate, fertile; corollas yellow, 7–12.4 × 4–8.8 mm. <b>Disc</b> florets 225–500+; corollas yellow proximally, yellow to brown to reddish brown distally, 1.1–1.8 mm, lobes 4. <b>Cypselae</b> 0.6–1.2 mm, moderately hairy; pappi of usually 6 entire, non-aristate scales 0.1–0.3 mm. <b>2n</b> = 26.</span><!--

-->{{Treatment/Body
|phenology=Flowering Mar–Jun (year round).
|habitat=Sandy or clay soils, ditches, around ponds and lakes, along streams
|elevation=0–1800 m
|distribution=Ala.;La.;Miss.;Pa.;Tex.;Mexico;West Indies (Cuba);Central America (Belize;Guatemala).
|discussion=<p><i>Helenium quadridentatum</i> is introduced in Pennsylvania.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Helenium quadridentatum
|authority=Labillardière
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|phenology=Flowering Mar–Jun (year round).
|habitat=Sandy or clay soils, ditches, around ponds and lakes, along streams
|elevation=0–1800 m
|distribution=Ala.;La.;Miss.;Pa.;Tex.;Mexico;West Indies (Cuba);Central America (Belize;Guatemala).
|reference=None
|publication title=Actes Soc. Hist. Nat. Paris
|publication year=1792
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_1089.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae
|genus=Helenium
|species=Helenium quadridentatum
}}<!--

-->[[Category:Treatment]][[Category:Helenium]]