Senecio flaccidus

Taxobox
name = Threadleaf Ragwort

---

image_width = 260px
image_caption = Threadleaf Ragwort
regnum = Plantae
divisio = Magnoliophyta
classis = Magnoliopsida
ordo = Asterales
familia = Asteraceae
subfamilia = Asteroideae
tribus = Senecioneae
genus = "Senecio"
species = "S. flaccidus"
binomial = "Senecio flaccidus"
binomial_authority = Less.cite web
url = http://plants.usda.gov/java/profile?symbol=SEFLF
title = PLANTS Profile, "Senecio flaccidus" Less. var. "flaccidus"
accessdate = 2008-02-20
author = Natural Resources Conservation Service (NRCS)
authorlink = Natural Resources Conservation Service
format = HTML
work = The PLANTS Database
publisher = United States Department of Agriculture ]
synonyms ="Senecio longilobus" Benth "Senecio filifolius" (L.) Hook. "Senecio douglasii" DC. "Senecio monoensis" Greenecite web
url = http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?316982
title = Taxon: "Senecio flaccidus" Less.
accessdate = 2008-02-20
author = Germplasm Resources Information Network (GRIN)
authorlink = Germplasm Resources Information Network
date = 2007-05-03
format = HTML
work = Taxonomy for Plants
publisher =

---

range_map_width = 260px
range_map_caption = Range of "S. flaccidus"

"Senecio flaccidus", formerly recorded as "Senecio douglasii" (in honor of the botanist David Douglas) member of the daisy family and genus "Senecio" also known as Threadleaf Groundsel (and Bush Senecio, Creek Senecio, Shrubby Butterweed, Comb Butterweed, Smooth Threadleaf Ragwort, Mono Ragwort, Douglas Ragwort, Douglas Groundsel, Sand Wash Groundsel, Felty Groundsel, Old Man, Yerba Cana, Squawweed or Cenicillo) is a native of the southwestern Great Plains of North America.cite web
url = http://www.biosurvey.ou.edu/shrub/sefld.htm
title = "Senecio flaccidus" Less. var. "flaccidus"
accessdate = 2008-02-20
author = Oklahoma Biological Survey
authorlink = University of Oklahoma
date = 99-09-20
format = HTML
work = Scientific Name Index
publisher = University of Oklahoma] cite web
url = http://www.calflora.net/bloomingplants/bushsenecio.html
title = "Senecio flaccidus" Less. var. "douglasii" (DC) B. Turner & T. Barkley
accessdate = 2008-02-20
author = Michael L. Charters
format = HTML
work = Wildflowers and Other Plants of Southern California] cite web
url = http://www.delange.org/GroundSel/GroundSel.htm
title = Sand Wash Groundsel
accessdate = 2008-02-20
author = George And Audrey DeLange
format = HTML
work = Arizona Wild Flowers Wildflower Pictures And Photos] cite web
url = http://www.fs.fed.us/global/iitf/pdf/shrubs/Senecio%20flaccidus.pdf
title = "Senecio flaccidus" Less.
accessdate = 2008-02-20
author = James E. Nellessen, Botanist, Biologist and Environmental Scientist
authorlink = United States Fish and Wildlife Service
format = PDF
publisher = United States Fish and Wildlife Service]

Description

Threadleaf ragwort is a fast growing, short lived (3 to 6 years) bushy perennial shrub growing to convert|4|ft|6|in|m|lk=on; common in gravelly washes, dry creek beds, along roads & trails and mostly away from the coast.

;Leaves and Stems: Branched and bushy, "Senecio flaccidus" gets its common name from its white, threadlike, bent and matted, tomentose leaves; alternate and deeply pinnated, divided into five to nine narrow linear segments, glaborous, having no hairs or projections, gray-green above, convert|1|in|cm|lk=on to convert|4|in|cm long. The principal leaves often have auxiliary clusters of smaller leaves. The stems are grooved and the branches are thin, herbaceous above and woody near the base.

;Flowers: Showy flowering heads of yellow ray flowers, convert|3|in|cm - convert|4|in|cm across; eight to thirteen sterile rays, purplish brown disk florets that produce the seeds.

;Seeds: Dicotyledon fruits; each a 1/8 inch (3 mm) long achene ribbed and hoary, covered with short white hairs.

Toxicity

Colonizing disturbed areas including over-grazed lands, "Senecio flaccidus" helps to achieve a quick ground cover and helps to stabilize the soil for longer-lived perennials but in this situation makes poor foraging for cattle and horses due to the alkaloids contained in the plant which cause liver disease when consumed in large quantities.

Also known as "Senecio longilobus", one of the alkaloids found in this species is longilobinecite journal
coauthors = Henderson FG, Harris PN, Chen KK.
title = Liver injury following administration of alpha- and beta- longilobine.
journal = Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
volume = 3
issue = 76
pages = 530–532
date = 1951 March
url = http://www.ncbi.nlm.nih.gov/pubmed/14844262
id = 14844262
accessdate = 2008-02-18] , as well as senecionine, seneciphylline, florosenine, otonecine-based florosenine, and retrorsine.

Distribution

Like many "Senecio" "Senecio flaccidus" likes disturbed habitats, this one preferring overgrazed rangelands, dried up stream beds and desert grasslands; at altitudes above convert|1800|ft|m|lk=on and below convert|6500|ft|m.

Native :America::North-Central: Kansas, Oklahoma::Northwestern: Colorado::South-Central: New Mexico, Texas::Southwestern: Arizona, Utah::Northern Mexico: Chihuahua, Coahuila, Durango, San Luis Potosí, Sonora, Zacatecas::Central Mexico: Aguascalientes, Guanajuato, Hidalgo, Jalisco (n.e.), Veracruz

Current :America::North-Central: Kansas, Oklahoma, Wyoming::Northwestern: Colorado::South-Central: New Mexico, Texas::Southwestern: Arizona, California, Nevada, Utah::Northern Mexico: Chihuahua, Coahuila, Durango, San Luis Potosí, Sonora, Zacatecas::Central Mexico: Aguascalientes, Baja Norte, Guanajuato, Hidalgo, Jalisco (n.e.), Veracruz

Subspecies which are synonyms

*"Senecio flaccidus" Less. var. "flaccidus"
*"Senecio douglasii" DC. var. "longilobus" (Benth.) L.D. Benson
*"Senecio douglasii" DC. var. "jamesii" (Torr. & A. Gray) Ediger ex Correll & M.C. Johnst.
*"Senecio douglasii" DC. ssp. "longilobus" (Benth.) W.A. Weber
*"Senecio flaccidus" Less. var. "monoensis" (Greene) B. L. Turner & T. M. Barkley
*"Senecio flaccidus" Less. var. "douglasii" (DC.) B. L. Turner & T. M. Barkley
*"Senecio flaccidus" var. "flaccidus"

References

ee also

*Pyrrolizidine

External links

*cite web
url = http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=505126
title = "Senecio flaccidus"
accessdate = 2008-02-20
authorlink = Integrated Taxonomic Information System
author =Integrated Taxonomic Information System Organization (ITIS)
date = Thursday, 20-Dec-2007 16:00:49 MST
format = HTML
work = Integrated Taxonomic Information System on-line database
*cite web
url = http://seinet.asu.edu/seinet/imageLibrary/viewimage.php?source=plants&taxon=Senecio flaccidus
title = "Senecio flaccidus"
accessdate = 2008-02-20
author = Arizona Vascular Plant Herbarium
authorlink = Arizona Vascular Plant Herbarium
format = HTML
publisher = Southwest Environmental Information Network
*cite web
url = http://www.calflora.org/cgi-bin/species_query.cgi?where-taxon=Senecio+flaccidus
title = Taxon Report - 7491
accessdate = 2008-02-20
author = Calflora
format = HTML
work = Information on California plants for education, research and conservation
publisher = [http://www.calflora.org The Calflora Database]