View source for Senecio riddellii

{{Treatment/ID
|accepted_name=Senecio riddellii
|accepted_authority=Torrey & A. Gray
|publications={{Treatment/Publication
|title=Fl. N. Amer.
|place=2: 444. 1843
|year=1843
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Senecio filifolius var. fremontii
|authority=Torrey & A. Gray
|rank=variety
}} {{Treatment/ID/Synonym
|name=Senecio riddellii var. parksii
|authority=Cory
|rank=variety
}} {{Treatment/ID/Synonym
|name=Senecio spartioides var. fremontii
|authority=(Torrey & A. Gray) Greenman
|rank=variety
}} {{Treatment/ID/Synonym
|name=Senecio spartioides var. parksii
|authority=(Cory) Shinners
|rank=variety
}} {{Treatment/ID/Synonym
|name=Senecio spartioides var. riddellii
|authority=(Torrey & A. Gray) Greenman
|rank=variety
}}
|hierarchy=Asteraceae;Asteraceae tribe Senecioneae;Senecio;Senecio riddellii
|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 riddellii]]</div></div>
|volume=Volume 20
|mention_page=page 548
|treatment_page=page 560
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Subshrubs,</b> 30–100 cm (taproots forming woody crowns). <b>Herbage</b> glabrous. <b>Stems</b> usually multiple (branching upward). <b>Leaves</b> ± evenly distributed (proximal often withering before flowering, pendulous); sessile or obscurely petiolate; blades linear-filiform (or irregularly pinnately divided into linear-filiform lobes), blades or lobes 4–9 cm × 1–5 mm, bases ± linear, ultimate margins entire. <b>Heads</b> 5–20+ in close, corymbiform arrays (involucres campanulate, 7–10 mm diam.). <b>Calyculi</b> usually of 3–8+ lance-linear to filiform bractlets (lengths 1/10–1/3 phyllaries). <b>Phyllaries</b> ± 13, 7–10(–12+) mm, tips green. <b>Ray</b> florets ± 8; corolla laminae (often falling early) 8–10 mm. <b>Cypselae</b> hirtellous. <b>2n</b> = 40.</span><!--

-->{{Treatment/Body
|phenology=Flowering mostly mid summer–fall, occasionally spring.
|habitat=Sandy or rocky open sites, especially drying, open, flood plains
|elevation=600–2500 m
|distribution=Ariz.;Colo.;Kans.;Nebr.;N.Mex.;Okla.;S.Dak.;Tex.;Wyo.
|discussion=<p><i>Senecio riddellii</i> intergrades morphologically with <i>S. spartioides</i>. Typically, the former has larger heads with campanulate involucres 7–10 mm diam.; the latter has cylindric involucres rarely more than 6 mm diam.</p><!--
--><p><i>Senecio riddellii</i> is poisonous to livestock. It is now locally scarce because of efforts to eradicate it.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Senecio riddellii
|authority=Torrey & A. Gray
|rank=species
|parent rank=genus
|synonyms=Senecio filifolius var. fremontii;Senecio riddellii var. parksii;Senecio spartioides var. fremontii;Senecio spartioides var. parksii;Senecio spartioides var. riddellii
|basionyms=
|family=Asteraceae
|phenology=Flowering mostly mid summer–fall, occasionally spring.
|habitat=Sandy or rocky open sites, especially drying, open, flood plains
|elevation=600–2500 m
|distribution=Ariz.;Colo.;Kans.;Nebr.;N.Mex.;Okla.;S.Dak.;Tex.;Wyo.
|reference=None
|publication title=Fl. N. Amer.
|publication year=1843
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V20_1246.xml
|tribe=Asteraceae tribe Senecioneae
|genus=Senecio
|species=Senecio riddellii
}}<!--

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