Difference between revisions of "Senecio riddellii"
Fl. N. Amer. 2: 444. 1843.
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|name=Senecio filifolius var. fremontii | |name=Senecio filifolius var. fremontii | ||
|authority=Torrey & A. Gray | |authority=Torrey & A. Gray | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Senecio riddellii var. parksii | |name=Senecio riddellii var. parksii | ||
|authority=Cory | |authority=Cory | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Senecio spartioides var. fremontii | |name=Senecio spartioides var. fremontii | ||
|authority=(Torrey & A. Gray) Greenman | |authority=(Torrey & A. Gray) Greenman | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Senecio spartioides var. parksii | |name=Senecio spartioides var. parksii | ||
|authority=(Cory) Shinners | |authority=(Cory) Shinners | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Senecio spartioides var. riddellii | |name=Senecio spartioides var. riddellii | ||
|authority=(Torrey & A. Gray) Greenman | |authority=(Torrey & A. Gray) Greenman | ||
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|elevation=600–2500 m | |elevation=600–2500 m | ||
|distribution=Ariz.;Colo.;Kans.;Nebr.;N.Mex.;Okla.;S.Dak.;Tex.;Wyo. | |distribution=Ariz.;Colo.;Kans.;Nebr.;N.Mex.;Okla.;S.Dak.;Tex.;Wyo. | ||
| − | |discussion=<p>Senecio riddellii intergrades morphologically with S. spartioides. 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><!-- | + | |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>Senecio riddellii is poisonous to livestock. It is now locally scarce because of efforts to eradicate it.</p> | + | --><p><i>Senecio riddellii</i> is poisonous to livestock. It is now locally scarce because of efforts to eradicate it.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1843 | |publication year=1843 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V20_1246.xml |
|tribe=Asteraceae tribe Senecioneae | |tribe=Asteraceae tribe Senecioneae | ||
|genus=Senecio | |genus=Senecio | ||
Revision as of 15:18, 18 September 2019
Subshrubs, 30–100 cm (taproots forming woody crowns). Herbage glabrous. Stems usually multiple (branching upward). Leaves ± 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. Heads 5–20+ in close, corymbiform arrays (involucres campanulate, 7–10 mm diam.). Calyculi usually of 3–8+ lance-linear to filiform bractlets (lengths 1/10–1/3 phyllaries). Phyllaries ± 13, 7–10(–12+) mm, tips green. Ray florets ± 8; corolla laminae (often falling early) 8–10 mm. Cypselae hirtellous. 2n = 40.
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
Senecio riddellii intergrades morphologically with S. spartioides. Typically, the former has larger heads with campanulate involucres 7–10 mm diam.; the latter has cylindric involucres rarely more than 6 mm diam.
Senecio riddellii is poisonous to livestock. It is now locally scarce because of efforts to eradicate it.
Selected References
None.