View source for Helianthella uniflora

{{Treatment/ID
|accepted_name=Helianthella uniflora
|accepted_authority=(Nuttall) Torrey & A. Gray
|publications={{Treatment/Publication
|title=Fl. N. Amer.
|place=2: 334. 1842
|year=1842
}}
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Helianthus uniflorus
|authority=Nuttall
|rank=species
|publication_title=J. Acad. Nat. Sci. Philadelphia
|publication_place=7: 37. 1834
}}
|synonyms={{Treatment/ID/Synonym
|name=Helianthella uniflora var. douglasii
|authority=(Torrey & A. Gray) W. A. Weber
|rank=variety
}}
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Ecliptinae;Helianthella;Helianthella uniflora
|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 Ecliptinae]]</div><div class="higher-taxon"><small>genus</small>[[Helianthella]]</div><div class="higher-taxon"><small>species</small>[[Helianthella uniflora]]</div></div>
|volume=Volume 21
|mention_page=page 115
|treatment_page=page 116
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>40–120 cm. <b>Cauline</b> leaves: largest at mid stems; blades usually 3-nerved, usually lanceolate to elliptic, rarely ovate, 12–25 cm, faces puberulent, hirsute, or scabrous. <b>Heads</b> usually borne singly, sometimes 2–3+, erect. <b>Involucres</b> turbinate to hemispheric or broader, 15–30 mm diam. <b>Phyllaries</b> lanceolate to lance-linear (subequal or outer larger, margins sometimes ciliate, faces ± cinereous-pubescent to sparsely puberulent). <b>Paleae</b> chartaceous, relatively firm. <b>Ray</b> florets 11–13(–21); laminae 15–30(–45) mm. <b>Disc</b> corollas yellow. <b>Cypselae</b> strongly compressed, narrowly obovate (margins ciliate, faces strigose); pappi of 2 ± subulate scales plus 2–4 shorter scales. <b>2n</b> = 30.</span><!--

-->{{Treatment/Body
|phenology=Flowering May–Jul(–Aug).
|habitat=Grasslands, meadows, sagebrush scrublands, swales, aspen forests, rocky slopes, and spruce-fir forests
|elevation=300–3400 m
|distribution=B.C.;Ariz.;Colo.;Idaho;Mont.;Nev.;Oreg.;Utah;Wash.;Wyo.
|discussion=<p>Two infraspecific taxa within <i>Helianthella uniflora</i> may be distinguished; they have been named at varietal rank.</p><!--
--><p>Variety douglasii has stems hirsute; involucres (15–)20–25(–30) mm diam.; outer phyllaries rarely elongated, margins ciliate, abaxial faces sparsely puberulent; ray laminae 30–40 mm; and 2n = 30. It grows in grasslands in the northern Rocky Mountains and on the east side of the Cascade Range (B.C.; Idaho, Oreg., Wash.) at 300–2500 m where it flowers May–Jul.</p><!--
--><p>Variety uniflora has stems sparingly puberulent to scabrous; involucres 15–20(–25) mm diam.; outer phyllaries frequently elongated, margins not ciliate, abaxial faces uniformly cinereous-pubescent; ray laminae 20–30 mm; and 2n = 30. It grows in meadows, sagebrush scrublands, swales, aspen forests, rocky slopes, and spruce-fir forests of the Rocky Mountains, intermountain plateaus, and Great Basin ranges (Ariz., Colo., Idaho, Mont., Nev., Oreg., Utah, Wyo.) at 1500–3400 m, where it flowers (May–)Jun–Jul(–Aug).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Helianthella uniflora
|authority=(Nuttall) Torrey & A. Gray
|rank=species
|parent rank=genus
|synonyms=Helianthella uniflora var. douglasii
|basionyms=Helianthus uniflorus
|family=Asteraceae
|phenology=Flowering May–Jul(–Aug).
|habitat=Grasslands, meadows, sagebrush scrublands, swales, aspen forests, rocky slopes, and spruce-fir forests
|elevation=300–3400 m
|distribution=B.C.;Ariz.;Colo.;Idaho;Mont.;Nev.;Oreg.;Utah;Wash.;Wyo.
|reference=None
|publication title=Fl. N. Amer.
|publication year=1842
|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_280.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae
|genus=Helianthella
|species=Helianthella uniflora
}}<!--

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