Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Senecio triangularis
open-in-new
<h2 id="description">Description</h2> <p>It is similar in form to <i><a href="/facts/Senecio_serra/TSP08uQH">Senecio serra</a></i>, both being four feet tall, have narrow and serrated leaves, and are topped with many small, yellow sunflowers. but <i>S. triangularis</i> is more common.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> <i>S. triangularis</i> has single erect stems, reaching up to 10–120 cm (4–47 in) tall.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> The stems have evenly distributed leaves.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> The leaves are up to 20 cm (8 in) long and triangular with tapered ends,<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> hence the name.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> </p><p>The green involucral <a href="/facts/Bract/pnMGNMdn">bracts</a> have black tips with hairy tufts.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> On display from June to September, the yellow <a href="/facts/Flower_heads/ANBv3Iym">flower heads</a> are up to 4 cm (1+1⁄2 in) wide, with about 8 rays around a disk.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p><p>As some plants are <a href="/facts/Diploid/U8zl4AQe">diploid</a>, meaning having two sets of <a href="/facts/Chromosome/FRGf11FC">chromosomes</a>; this can be used to identify hybrids and classification of groupings. It has been counted as 2n = 40, 80.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> </p> <h2 id="taxonomy">Taxonomy</h2> <p>It has the common names of arrowleaf ragwort, arrowleaf groundsel,<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> and arrowleaf butterweed. </p><p>In the early 1830s, Scottish botanist <a href="/facts/Thomas_Drummond_(botanist)/PYLBPm15">Thomas Drummond</a> collected this plant, probably on his second trip to the United States. The plant was named by Drummond's mentor, <a href="/facts/William_Jackson_Hooker/vFUbLV99">William Jackson Hooker</a>, who first published and described it in 1834.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a><a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> </p> <h2 id="distribution-and-habitat">Distribution and habitat</h2> <p>It is <a href="/facts/Native_plant/03kpM3rf">native</a> to temperate regions of America:<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> </p> <a href="/facts/Nearctic/BxcNvqhk">Nearctic</a>: Subarctic America: <a href="/facts/Northwest_Territory/F7lcMePt">Northwest Territory</a>, <a href="/facts/Yukon_Territory/JAGCCGCW">Yukon Territory</a>, <a href="/facts/Alaska/LlDNr2uR">Alaska</a> Western Canada: <a href="/facts/Alberta/PjKJFbJY">Alberta</a>, <a href="/facts/British_Columbia/Ty3e3g1Q">British Columbia</a> Northwestern United States: <a href="/facts/Colorado/IgIHrJI5">Colorado</a>, <a href="/facts/Idaho/68ELs9Um">Idaho</a>, <a href="/facts/Montana/jPFKMuK5">Montana</a>, <a href="/facts/Oregon/4Uq446Ko">Oregon</a>, <a href="/facts/Washington_(U.S._state)/7tCrTFnN">Washington</a>, <a href="/facts/Wyoming/kuKmWryL">Wyoming</a> Southwestern United States: <a href="/facts/Arizona/6ayM3swJ">Arizona</a>, <a href="/facts/California/zLW2vdQJ">California</a>, <a href="/facts/Nevada/HNWhCrQv">Nevada</a>, <a href="/facts/Utah/te7zUyBX">Utah</a>, <a href="/facts/New_Mexico/wosJCGaW">New Mexico</a> <p>It grows in open woodlands, (mainly <a href="/facts/Coniferous/vDUgqxCx">coniferous</a> forests) and on rocky stream sides.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> They can grow at altitudes of between 100 and 3,500 m (330 and 11,480 ft).<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p> <h2 id="ecology">Ecology</h2> <p>It is reportedly poisonous to animals.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> </p> <h2 id="external-links">External links</h2> <p> Media related to Senecio triangularis at Wikimedia Commons </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>NRCS. "Senecio triangularis". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 10 November 2015. <a href="/wiki/Natural_Resources_Conservation_Service" target="_blank">/wiki/Natural_Resources_Conservation_Service</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. <a href="https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm" target="_blank">https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017. <a href="http://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDAST8H360" target="_blank">http://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDAST8H360</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. <a href="/wiki/Flora_of_North_America" target="_blank">/wiki/Flora_of_North_America</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. <a href="/wiki/Flora_of_North_America" target="_blank">/wiki/Flora_of_North_America</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. <a href="https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm" target="_blank">https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Spellenberg, Richard (2001) [1979]. National Audubon Society Field Guide to North American Wildflowers: Western Region (rev ed.). Knopf. p. 397. ISBN 978-0-375-40233-3. <a href="978-0-375-40233-3" target="_blank">978-0-375-40233-3</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine Publishing. p. 298. ISBN 1-55105-042-0. <a href="1-55105-042-0" target="_blank">1-55105-042-0</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Spellenberg, Richard (2001) [1979]. National Audubon Society Field Guide to North American Wildflowers: Western Region (rev ed.). Knopf. p. 397. ISBN 978-0-375-40233-3. <a href="978-0-375-40233-3" target="_blank">978-0-375-40233-3</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. <a href="/wiki/Flora_of_North_America" target="_blank">/wiki/Flora_of_North_America</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017. <a href="http://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDAST8H360" target="_blank">http://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDAST8H360</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. <a href="/wiki/Flora_of_North_America" target="_blank">/wiki/Flora_of_North_America</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>"YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. <a href="https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm" target="_blank">https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>"Senecio triangularis". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 2008-05-27. <a href="https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=451256" target="_blank">https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=451256</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. <a href="/wiki/Flora_of_North_America" target="_blank">/wiki/Flora_of_North_America</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>"YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. <a href="https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm" target="_blank">https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. <a href="/wiki/Flora_of_North_America" target="_blank">/wiki/Flora_of_North_America</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Reiner, Ralph E. (1969). Introducing the Flowering Beauty of Glacier National Park and the Majestic High Rockies. Glacier Park, Inc. p. 44. <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> </ol>