|Senecio triangularis in Mount Rainier National Park|
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 than S. serra. S. triangularis has single erect stems, reaching up to 10–120 cm (4–47 in) tall. The stems have evenly distributed leaves. The leaves are triangular, with tapered ends, hence the name. The flowers have a prominent central dome, with ray florets around 8 cm wide.
It has the common names of arrowleaf ragwort, arrowleaf groundsel, and arrowleaf butterweed.
In the early 1930s, Scottish botanist Thomas Drummond collected this plant, probably on his second trip to the United States The plant was the named by William Hooker, Drummond's mentor, and first published and described by Hooker in 'Flora Boreali-Americana' (Fl. Bor.-Amer.) Vol.1 on page 332 in 1834.
Distribution and habitat
- International Plant Names Index (IPNI). Royal Botanic Gardens, Kew https://www.ipni.org/n/248228-1. Retrieved 2008-05-27. Missing or empty
- Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27.
- "Senecio triangularis". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 10 November 2015.
- Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine Publishing. p. 298. ISBN 1-55105-042-0.
- "YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017.
- "Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017.
- "Senecio triangularis". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 2008-05-27.
Media related to Senecio triangularis at Wikimedia Commons
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