View source for Helianthus petiolaris

{{Treatment/ID
|accepted_name=Helianthus petiolaris
|accepted_authority=Nuttall
|publications={{Treatment/Publication
|title=J. Acad. Nat. Sci. Philadelphia
|place=2: 115. 1821
|year=1821
}}
|common_names=Prairie sunflower
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Helianthinae;Helianthus;Helianthus petiolaris
|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 petiolaris]]</div></div>
|volume=Volume 21
|mention_page=page 142, 150, 151, 154, 155
|treatment_page=page 152
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 40–200 cm. <b>Stems</b> erect, usually densely canescent, hispid, or strigillose, rarely ± hirsute or glabrate. <b>Leaves</b> mostly cauline; mostly alternate; petioles 2–4 cm; blades (often bluish green) lanceolate to deltate-ovate or ovate, 4–15 × 1–8 cm, bases subcordate or truncate to cuneate, margins entire or ± serrate, abaxial faces strigose, sparsely to densely, or not at all, gland-dotted. <b>Heads</b> 1–5. <b>Peduncles</b> 4–15(–40) cm. <b>Involucres</b> ± hemispheric, 10–24 mm diam. <b>Phyllaries</b> 14–25, lance-linear to lanceolate to lance-ovate, 10–14 × 1–4(–5) mm, (margins sometimes ciliate) apices short-attenuate, abaxial faces usually hispidulous, rarely sparsely hirsute to glabrate. <b>Paleae</b> 4.5–7.5 mm, 3-toothed, middle teeth ± ciliate or bearded, hairs whitish, 0.5–0.7 mm. <b>Ray</b> florets 10–30; laminae 15–20 mm. <b>Disc</b> florets 50–100+; corollas 4.5–6 mm, lobes usually reddish, rarely yellow; anthers reddish to purplish, appendages purplish (style branches reddish). <b>Cypselae</b> 3–4.5 mm, ± villous; pappi of 2 aristate scales 1.5–3 mm plus 0–2 erose scales 0.3–0.5 mm. <b>2n</b> = 34.</span><!--

-->{{Treatment/Body
|distribution=Alta.;Man.;Ont.;Sask.;Ariz.;Ark.;Calif.;Colo.;Conn.;D.C.;Del.;Idaho;Ill.;Ind.;Iowa;Kans.;La.;Maine;Mass.;Mich.;Minn.;Mo.;Mont.;N.C.;N.Dak.;N.J.;N.Mex.;N.Y.;Nebr.;Nev.;Ohio;Okla.;Oreg.;Pa.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Va.;W.Va.;Wash.;Wis.;Wyo.
|discussion=<p>Subspecies 2 (2 in the flora).</p><!--
--><p><i>Helianthus petiolaris</i> is adventive beyond western North America.</p><!--
--><p>A third subspecies has yet to be named at that rank in <i>Helianthus petiolaris</i>; it has been called <i>H. petiolaris</i> <i></i>var.<i> canescens</i> A. Gray. It differs in having stems, leaves, and phyllaries densely canescent and abaxial faces of leaves densely gland-dotted. It is additionally characterized by peduncles usually ebracteate, phyllaries 1–2 mm wide, disc corolla throats gradually narrowed distal to slight, not densely hairy basal bulges, and 2n = 34. It flowers late spring through late summer and grows on sandy soils in open areas at (10–)1000–2300 m in Arizona, California, <i>Nevada</i>, New Mexico, and Texas and in Mexico. It was treated as <i>H. niveus</i> (Bentham) Brandegee <i></i>subsp.<i> canescens</i> (A. Gray) Heiser by C. B. Heiser et al. (1969); molecular and morphologic data appear to favor a placement within <i>H. petiolaris</i>.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Stems usually hispidulous to strigillose; peduncles usually bractless; phyllaries 3–5 mm wide; disc corollas: throats abruptly narrowed distal to densely hairy basal bulbs
|[[Helianthus petiolaris subsp. petiolaris|Helianthus petiolaris subsp. petiolaris]]
|-id=key-0-1
|1
|Stems usually ± hispid; peduncles usually each with leafy bract subtending head; phyllaries 2–3.5 mm wide; disc corollas: throats gradually narrowed distal to slight, not densely hairy, basal bulges
|[[Helianthus petiolaris subsp. fallax|Helianthus petiolaris subsp. fallax]]
|}
</div></div><!--

-->{{#Taxon:
name=Helianthus petiolaris
|authority=Nuttall
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=Alta.;Man.;Ont.;Sask.;Ariz.;Ark.;Calif.;Colo.;Conn.;D.C.;Del.;Idaho;Ill.;Ind.;Iowa;Kans.;La.;Maine;Mass.;Mich.;Minn.;Mo.;Mont.;N.C.;N.Dak.;N.J.;N.Mex.;N.Y.;Nebr.;Nev.;Ohio;Okla.;Oreg.;Pa.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Va.;W.Va.;Wash.;Wis.;Wyo.
|reference=None
|publication title=J. Acad. Nat. Sci. Philadelphia
|publication year=1821
|special status=Illustrated;Endemic
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_359.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae
|genus=Helianthus
|species=Helianthus petiolaris
}}<!--

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