Senecio triangularis, known as arrowleaf ragwort,[3] arrowleaf groundsel and arrowleaf butterweed, is a species of the genus Senecio and family Asteraceae.
| Senecio triangularis | |
|---|---|
| |
| Senecio triangularis in Mount Rainier National Park | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Senecio |
| Species: | S. triangularis
|
| Binomial name | |
| Senecio triangularis | |
| Synonyms | |
|
Senecio gibbonsii Greene | |
Description
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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.[5] S. triangularis has single erect stems, reaching up to 10–120 cm (4–47 in) tall.[6] The stems have evenly distributed leaves.[2] The leaves are triangular, with tapered ends,[2][5] hence the name.
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.[2]
It is native to temperate regions of America[7] and is reportedly poisonous to animals.[8]
Taxonomy
editIt has the common names of arrowleaf ragwort, arrowleaf groundsel,[6] 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 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.[2][5]
Distribution
edit- Native
- 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
Habitat
editIt grows in open woodlands, (mainly coniferous forests) and on rocky stream sides.[2][5] They can grow at altitudes of between 100 and 3,500 m (330 and 11,480 ft).[2]
References
edit- ^ "Senecio viscosissimus". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens. 2008-05-27.
- ^ a b c d e f g Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27.
- ^ USDA, NRCS (n.d.). "Senecio triangularis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 10 November 2015.
- ^ Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine Publishing. p. 298. ISBN 1-55105-042-0.
- ^ a b c d "YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017.
- ^ a b "Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017.
- ^ a b "Senecio triangularis". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 2008-05-27.
- ^ Reiner, Ralph E. (1969). Introducing the Flowering Beauty of Glacier National Park and the Majestic High Rockies. Glacier Park, Inc. p. 44.
External links
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Media related to Senecio triangularis at Wikimedia Commons
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