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Senecio triangularis
Species of flowering plant

Senecio triangularis, known as arrowleaf ragwort, arrowleaf groundsel and arrowleaf butterweed, is a species of the genus Senecio and family Asteraceae.

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Description

It is similar in form to Senecio serra, both being four feet tall, have narrow and serrated leaves, and are topped with many small, yellow sunflowers. but S. triangularis is more common.2 S. triangularis has single erect stems, reaching up to 10–120 cm (4–47 in) tall.3 The stems have evenly distributed leaves.4 The leaves are up to 20 cm (8 in) long and triangular with tapered ends,56 hence the name.7

The green involucral bracts have black tips with hairy tufts.8 On display from June to September, the yellow flower heads are up to 4 cm (1+1⁄2 in) wide, with about 8 rays around a disk.9

As some plants are diploid, meaning having two sets of chromosomes; this can be used to identify hybrids and classification of groupings. It has been counted as 2n = 40, 80.10

Taxonomy

It has the common names of arrowleaf ragwort, arrowleaf groundsel,11 and arrowleaf butterweed.

In the early 1830s, Scottish botanist Thomas Drummond collected this plant, probably on his second trip to the United States. The plant was named by Drummond's mentor, William Jackson Hooker, who first published and described it in 1834.1213

Distribution and habitat

It is native to temperate regions of America:14

Nearctic: Subarctic America: Northwest Territory, Yukon Territory, Alaska Western Canada: Alberta, British Columbia Northwestern United States: Colorado, Idaho, Montana, Oregon, Washington, Wyoming Southwestern United States: Arizona, California, Nevada, Utah, New Mexico

It grows in open woodlands, (mainly coniferous forests) and on rocky stream sides.1516 They can grow at altitudes of between 100 and 3,500 m (330 and 11,480 ft).17

Ecology

It is reportedly poisonous to animals.18

Media related to Senecio triangularis at Wikimedia Commons

References

  1. NRCS. "Senecio triangularis". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 10 November 2015. /wiki/Natural_Resources_Conservation_Service ↩

  2. "YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm ↩

  3. "Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017. http://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDAST8H360 ↩

  4. Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. /wiki/Flora_of_North_America ↩

  5. Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. /wiki/Flora_of_North_America ↩

  6. "YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm ↩

  7. 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. 978-0-375-40233-3 ↩

  8. Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine Publishing. p. 298. ISBN 1-55105-042-0. 1-55105-042-0 ↩

  9. 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. 978-0-375-40233-3 ↩

  10. Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. /wiki/Flora_of_North_America ↩

  11. "Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017. http://fieldguide.mt.gov/speciesDetail.aspx?elcode=PDAST8H360 ↩

  12. Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. /wiki/Flora_of_North_America ↩

  13. "YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm ↩

  14. "Senecio triangularis". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 2008-05-27. https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=451256 ↩

  15. Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. /wiki/Flora_of_North_America ↩

  16. "YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017. https://www.swcoloradowildflowers.com/Yellow%20Enlarged%20Photo%20Pages/senecio%20serra%20and%20triangularis.htm ↩

  17. Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27. /wiki/Flora_of_North_America ↩

  18. Reiner, Ralph E. (1969). Introducing the Flowering Beauty of Glacier National Park and the Majestic High Rockies. Glacier Park, Inc. p. 44. ↩