Senecio triangularis
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| Senecio triangularis in Mount Rainier National Park | |
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| Scientific classification Edit this classification | |
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Senecio gibbonsii Greene | |
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Senecio triangularis, known as arrowleaf ragwort,[3] arrowleaf groundsel and arrowleaf butterweed, is a species of the genus Senecio and family Asteraceae.
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.[4] S. triangularis has single erect stems, reaching up to 10–120 cm (4–47 in) tall.[5] The stems have evenly distributed leaves.[2] The leaves are up to 20 cm (8 in) long and triangular with tapered ends,[2][4] hence the name.[6]
The green involucral bracts have black tips with hairy tufts.[7] On display from June to September, the yellow flower heads are up to Page Template:Fraction/styles.css has no content.4 cm (1+1⁄2 in) wide, with about 8 rays around a disk.[6]
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]
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Taxonomy
It has the common names of arrowleaf ragwort, arrowleaf groundsel,[5] 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.[2][4]
Distribution and habitat
It is native to temperate regions of America:[8]
- 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.[2][4] They can grow at altitudes of between 100 and 3,500 m (330 and 11,480 ft).[2]
Ecology
It is reportedly poisonous to animals.[9]
References
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- ^ a b c d e f g Page Module:Citation/CS1/styles.css has no content.Flora of North America. "45. Senecio triangularis Hooker". Retrieved 2008-05-27.
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- ^ a b c d Page Module:Citation/CS1/styles.css has no content."YELLOW FLOWERS". swcoloradowildflowers.com. Retrieved 23 July 2017.
- ^ a b Page Module:Citation/CS1/styles.css has no content."Arrow-leaf Groundsel - Senecio triangularis". fieldguide.mt.gov. Retrieved 23 July 2017.
- ^ a b Page Module:Citation/CS1/styles.css has no content.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.
- ^ Page Module:Citation/CS1/styles.css has no content.Pojar, Jim; Andy MacKinnon (1994). Plants of the Pacific Northwest. Lone Pine Publishing. p. 298. ISBN 1-55105-042-0.
- ^ Script error: No such module "template wrapper".
- ^ Page Module:Citation/CS1/styles.css has no content.Reiner, Ralph E. (1969). Introducing the Flowering Beauty of Glacier National Park and the Majestic High Rockies. Glacier Park, Inc. p. 44.
External links
Page Template:Sister-inline/styles.css has no content.Script error: No such module "Sister project logo". Media related to Script error: No such module "Commons link". at Wikimedia Commons
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