View source for Senecio hydrophiloides

{{Treatment/ID
|accepted_name=Senecio hydrophiloides
|accepted_authority=Rydberg
|publications={{Treatment/Publication
|title=Mem. New York Bot. Gard.
|place=1: 441. 1900
|year=1900
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Senecio foetidus
|authority=Howell
}}{{Treatment/ID/Synonym
|name=Senecio foetidus var. hydrophiloides
|authority=(Rydberg) T. M. Barkley ex Cronquist
}}{{Treatment/ID/Synonym
|name=Senecio oreganus
|authority=unknown
}}
|hierarchy=Asteraceae;Asteraceae tribe Senecioneae;Senecio;Senecio hydrophiloides
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Senecioneae]]</div><div class="higher-taxon"><small>genus</small>[[Senecio]]</div><div class="higher-taxon"><small>species</small>[[Senecio hydrophiloides]]</div></div>
|volume=Volume 20
|mention_page=page 547
|treatment_page=page 558
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials </b>(biennials?), 30–100(–140) cm (caudices erect, roots fleshy-fibrous). <b>Herbage</b> usually glabrous or glabrescent (young plants sparsely tomentose). <b>Stems</b> usually single, sometimes 2–4 clustered (sometimes reddish-tinged). <b>Leaves</b> progressively reduced distally; usually petiolate (petioles often winged); blades elliptic to broadly lanceolate, 5–15(–20) × 2–7 cm, bases broadly to narrowly tapered, margins dentate to denticulate (distal leaves sessile, bractlike). <b>Heads</b> (6–)15–30+ in congested or loose, corymbiform arrays. <b>Calyculi</b> of 2–5 bractlets (less than 2 mm). <b>Phyllaries</b> (± 8) ± 13 (± 21), 4–9 mm, tips (minutely to prominently) black. <b>Ray</b> florets 0 or (± 3 or 5) ± 8; corolla laminae 5–10 mm. <b>Cypselae</b> glabrous. <b>2n</b> = 40.</span><!--

-->{{Treatment/Body
|phenology=Flowering spring–early summer.
|habitat=Damp hillsides, non-alkaline meadows, seepage sites
|elevation=1200–2200 m
|distribution=Alta.;B.C.;Calif.;Idaho;Mont.;Nev.;Oreg.;Utah;Wash.;Wyo.
|discussion=<p>Plants of Senecio hydrophiloides from toward the western end of the range tend to have the heads more or less congested and eradiate and stems loosely clustered; plants from toward the eastern edge tend to have heads loosely arrayed and radiate and stems single. The two forms have been recognized as weakly defined species (or varieties), the former as Senecio foetidus and the latter as S. hydrophiloides. They intergrade so completely that they are best treated as a single, variable taxon. The use of the epithet foetidus for the broadly conceived single species was based on a bibliographic misunderstanding; the correct epithet is hydrophiloides (T. M. Barkley 1978; A. Cronquist 1994).</p><!--
--><p>In 1900, Thomas Howell gave the name Senecio oreganus to a collection from Lake Labish, near Salem, Oregon. The area has seen much disturbance and development since Howell’s time, and the plant appears to be extinct in the region. The collection is difficult to exclude from S. hydrophiloides, and the collection is here regarded as an odd outlier of S. hydrophiloides, which is known chiefly from east of the Cascade uplift. Howell’s collection and therefore the name S. oreganus also have been treated within S. sphaerocephalus (T. M. Barkley 1978; A. Cronquist 1955); that attribution appears to be in error. The “type” materials are now in the herbarium of Oregon State University in Corvallis.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Senecio hydrophiloides
|author=
|authority=Rydberg
|rank=species
|parent rank=genus
|synonyms=Senecio foetidus;Senecio foetidus var. hydrophiloides;Senecio oreganus
|basionyms=
|family=Asteraceae
|phenology=Flowering spring–early summer.
|habitat=Damp hillsides, non-alkaline meadows, seepage sites
|elevation=1200–2200 m
|distribution=Alta.;B.C.;Calif.;Idaho;Mont.;Nev.;Oreg.;Utah;Wash.;Wyo.
|reference=None
|publication title=Mem. New York Bot. Gard.
|publication year=1900
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V20_1237.xml
|tribe=Asteraceae tribe Senecioneae
|genus=Senecio
|species=Senecio hydrophiloides
}}<!--

-->[[Category:Treatment]][[Category:Senecio]]