View source for Helenium flexuosum

{{Treatment/ID
|accepted_name=Helenium flexuosum
|accepted_authority=Rafinesque
|publications={{Treatment/Publication
|title=New Fl.
|place=4: 81. 1838
|year=1838
}}
|common_names=Purplehead sneezeweed;hélénie nudiflore
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Helenium nudiflorum
|authority=Nuttall
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Gaillardiinae;Helenium;Helenium flexuosum
|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 flexuosum]]</div></div>
|volume=Volume 21
|mention_page=page 427, 430
|treatment_page=page 429
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 30–100 cm. <b>Stems</b> usually 1, usually branched distally, strongly winged, glabrous or sparsely hairy proximally, sparsely to moderately hairy distally. <b>Leaves</b> glabrous or sparsely to moderately hairy; basal blades oblanceolate to obovate or spatulate, entire or serrate; proximal and mid blades oblanceolate to lanceolate, entire or toothed; distal blades lanceolate to lance-linear, entire. <b>Heads</b> (1–)5–50(–80+) per plant, in paniculiform arrays. <b>Peduncles</b> 3–10 cm, sparsely to moderately hairy. <b>Involucres</b> globoid to usually ovoid, 8–17 × 9–17 mm. <b>Phyllaries</b> (connate proximally) moderately to densely hairy. <b>Ray</b> florets usually 8–13, neuter, sometimes 0; corollas yellow to reddish brown to red to purple, 10–20 × 5–10 mm. <b>Disc</b> florets 250–500(–700+); corollas yellow proximally and purple distally or purple throughout, 2.3–3.7 mm, lobes 4(–5). <b>Cypselae</b> 1–1.2 mm, moderately hairy; pappi of 5–6 entire, aristate scales 0.6–1(–1.7) mm. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering (Apr–)May–Jul(–Oct).
|habitat=Ditches, fields, washes, along streams
|elevation=10–900 m
|distribution=N.S.;Ont.;Que.;Ala.;Ark.;Fla.;Ga.;Ill.;Ind.;Ky.;La.;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Tex.;Va.;W.Va.;Wis.
|discussion=<p>It has been suggested that <i>Helenium flexuosum</i> may be of hybrid origin from <i>H. campestre</i> (perennial, 2n = 28) and some member of <i>Helenium</i> sect. Tetrodus (H. F. L. Rock 1957). The only member of sect. Tetrodus that has a chromosome number of 2n = 28 is <i>H. linifolium</i>, an annual from southern Texas.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Helenium flexuosum
|authority=Rafinesque
|rank=species
|parent rank=genus
|synonyms=Helenium nudiflorum
|basionyms=
|family=Asteraceae
|phenology=Flowering (Apr–)May–Jul(–Oct).
|habitat=Ditches, fields, washes, along streams
|elevation=10–900 m
|distribution=N.S.;Ont.;Que.;Ala.;Ark.;Fla.;Ga.;Ill.;Ind.;Ky.;La.;Md.;Mass.;Mich.;Miss.;Mo.;N.J.;N.C.;Ohio;Okla.;Pa.;S.C.;Tenn.;Tex.;Va.;W.Va.;Wis.
|reference=None
|publication title=New Fl.
|publication year=1838
|special status=Endemic
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V19-20-21/V21_1073.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae
|genus=Helenium
|species=Helenium flexuosum
}}<!--

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